Add comprehensive repository improvements: documentation, CI/CD, code quality tooling

.editorconfig

@@ -0,0 +1,185 @@
+# .editorconfig is awesome: https://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+# All files
+[*]
+charset = utf-8
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_style = space
+
+# XML project files
+[*.{csproj,vbproj,vcxproj,vcxproj.filters,proj,projitems,shproj}]
+indent_size = 2
+
+# XML config files
+[*.{props,targets,ruleset,config,nuspec,resx,vsixmanifest,vsct}]
+indent_size = 2
+
+# JSON files
+[*.json]
+indent_size = 2
+
+# YAML files
+[*.{yml,yaml}]
+indent_size = 2
+
+# Markdown files
+[*.md]
+trim_trailing_whitespace = false
+
+# Shell scripts
+[*.sh]
+end_of_line = lf
+
+# Batch files
+[*.{cmd,bat}]
+end_of_line = crlf
+
+# C# files
+[*.cs]
+indent_size = 4
+
+# New line preferences
+csharp_new_line_before_open_brace = all
+csharp_new_line_before_else = true
+csharp_new_line_before_catch = true
+csharp_new_line_before_finally = true
+csharp_new_line_before_members_in_object_initializers = true
+csharp_new_line_before_members_in_anonymous_types = true
+csharp_new_line_between_query_expression_clauses = true
+
+# Indentation preferences
+csharp_indent_case_contents = true
+csharp_indent_switch_labels = true
+csharp_indent_labels = no_change
+csharp_indent_block_contents = true
+csharp_indent_braces = false
+csharp_indent_case_contents_when_block = false
+
+# Space preferences
+csharp_space_after_cast = false
+csharp_space_after_keywords_in_control_flow_statements = true
+csharp_space_between_method_call_parameter_list_parentheses = false
+csharp_space_between_method_declaration_parameter_list_parentheses = false
+csharp_space_between_parentheses = false
+csharp_space_before_colon_in_inheritance_clause = true
+csharp_space_after_colon_in_inheritance_clause = true
+csharp_space_around_binary_operators = before_and_after
+csharp_space_between_method_declaration_empty_parameter_list_parentheses = false
+csharp_space_between_method_call_name_and_opening_parenthesis = false
+csharp_space_between_method_call_empty_parameter_list_parentheses = false
+csharp_space_after_comma = true
+csharp_space_after_dot = false
+
+# Organize usings
+dotnet_sort_system_directives_first = true
+dotnet_separate_import_directive_groups = false
+
+# Code style defaults
+csharp_using_directive_placement = outside_namespace:warning
+csharp_prefer_braces = true:suggestion
+csharp_preserve_single_line_blocks = true
+csharp_preserve_single_line_statements = false
+csharp_prefer_static_local_function = true:suggestion
+csharp_prefer_simple_using_statement = true:suggestion
+csharp_style_prefer_switch_expression = true:suggestion
+
+# Expression-level preferences
+dotnet_style_object_initializer = true:suggestion
+dotnet_style_collection_initializer = true:suggestion
+dotnet_style_explicit_tuple_names = true:suggestion
+dotnet_style_prefer_inferred_tuple_names = true:suggestion
+dotnet_style_prefer_inferred_anonymous_type_member_names = true:suggestion
+dotnet_style_prefer_auto_properties = true:suggestion
+dotnet_style_prefer_conditional_expression_over_return = false:silent
+dotnet_style_prefer_conditional_expression_over_assignment = false:silent
+dotnet_style_prefer_compound_assignment = true:suggestion
+
+# Expression-bodied members
+csharp_style_expression_bodied_methods = false:silent
+csharp_style_expression_bodied_constructors = false:silent
+csharp_style_expression_bodied_operators = false:silent
+csharp_style_expression_bodied_properties = true:suggestion
+csharp_style_expression_bodied_indexers = true:suggestion
+csharp_style_expression_bodied_accessors = true:suggestion
+csharp_style_expression_bodied_lambdas = true:suggestion
+csharp_style_expression_bodied_local_functions = false:silent
+
+# Pattern matching
+csharp_style_pattern_matching_over_is_with_cast_check = true:suggestion
+csharp_style_pattern_matching_over_as_with_null_check = true:suggestion
+csharp_style_inlined_variable_declaration = true:suggestion
+
+# Null checking preferences
+csharp_style_throw_expression = true:suggestion
+csharp_style_conditional_delegate_call = true:suggestion
+
+# Other features
+csharp_style_prefer_index_operator = true:suggestion
+csharp_style_prefer_range_operator = true:suggestion
+csharp_style_pattern_local_over_anonymous_function = true:suggestion
+
+# Var usage
+csharp_style_var_for_built_in_types = false:silent
+csharp_style_var_when_type_is_apparent = true:suggestion
+csharp_style_var_elsewhere = false:silent
+
+# Naming conventions
+dotnet_naming_rule.interfaces_should_be_prefixed_with_i.severity = warning
+dotnet_naming_rule.interfaces_should_be_prefixed_with_i.symbols = interface
+dotnet_naming_rule.interfaces_should_be_prefixed_with_i.style = begins_with_i
+
+dotnet_naming_rule.types_should_be_pascal_case.severity = warning
+dotnet_naming_rule.types_should_be_pascal_case.symbols = types
+dotnet_naming_rule.types_should_be_pascal_case.style = pascal_case
+
+dotnet_naming_rule.non_field_members_should_be_pascal_case.severity = warning
+dotnet_naming_rule.non_field_members_should_be_pascal_case.symbols = non_field_members
+dotnet_naming_rule.non_field_members_should_be_pascal_case.style = pascal_case
+
+dotnet_naming_rule.private_fields_should_be_prefixed_with_underscore.severity = warning
+dotnet_naming_rule.private_fields_should_be_prefixed_with_underscore.symbols = private_fields
+dotnet_naming_rule.private_fields_should_be_prefixed_with_underscore.style = begins_with_underscore
+
+# Symbol specifications
+dotnet_naming_symbols.interface.applicable_kinds = interface
+dotnet_naming_symbols.interface.applicable_accessibilities = public, internal, private, protected, protected_internal, private_protected
+dotnet_naming_symbols.interface.required_modifiers = 
+
+dotnet_naming_symbols.types.applicable_kinds = class, struct, interface, enum
+dotnet_naming_symbols.types.applicable_accessibilities = public, internal, private, protected, protected_internal, private_protected
+dotnet_naming_symbols.types.required_modifiers = 
+
+dotnet_naming_symbols.non_field_members.applicable_kinds = property, event, method
+dotnet_naming_symbols.non_field_members.applicable_accessibilities = public, internal, private, protected, protected_internal, private_protected
+dotnet_naming_symbols.non_field_members.required_modifiers = 
+
+dotnet_naming_symbols.private_fields.applicable_kinds = field
+dotnet_naming_symbols.private_fields.applicable_accessibilities = private
+dotnet_naming_symbols.private_fields.required_modifiers = 
+
+# Naming styles
+dotnet_naming_style.begins_with_i.required_prefix = I
+dotnet_naming_style.begins_with_i.required_suffix = 
+dotnet_naming_style.begins_with_i.word_separator = 
+dotnet_naming_style.begins_with_i.capitalization = pascal_case
+
+dotnet_naming_style.pascal_case.required_prefix = 
+dotnet_naming_style.pascal_case.required_suffix = 
+dotnet_naming_style.pascal_case.word_separator = 
+dotnet_naming_style.pascal_case.capitalization = pascal_case
+
+dotnet_naming_style.begins_with_underscore.required_prefix = _
+dotnet_naming_style.begins_with_underscore.required_suffix = 
+dotnet_naming_style.begins_with_underscore.word_separator = 
+dotnet_naming_style.begins_with_underscore.capitalization = camel_case
+
+# Code quality rules
+dotnet_code_quality_unused_parameters = all:suggestion
+dotnet_remove_unnecessary_suppression_exclusions = none
+
+# C# 8.0+ nullable reference types
+csharp_nullable_reference_types = enable:suggestion

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,61 @@
+---
+name: Bug Report
+about: Report a bug or unexpected behavior
+title: '[BUG] '
+labels: bug
+assignees: ''
+---
+
+## Bug Description
+
+A clear and concise description of what the bug is.
+
+## Platform
+
+- [ ] Android
+- [ ] iOS
+- [ ] Windows/.NET
+
+## Environment
+
+- **SecureHttpClient Version**: (e.g., 2.4.3)
+- **Target Framework**: (e.g., net10.0, net10.0-android36.1)
+- **OS Version**: (e.g., Android 14, iOS 17.1, Windows 11)
+- **Device**: (e.g., Pixel 8, iPhone 15, Desktop)
+- **.NET SDK Version**: (e.g., 10.0.101)
+
+## Steps to Reproduce
+
+1. 
+2. 
+3. 
+
+## Expected Behavior
+
+A clear and concise description of what you expected to happen.
+
+## Actual Behavior
+
+A clear and concise description of what actually happened.
+
+## Code Sample
+
+```csharp
+// Minimal reproducible code sample
+var handler = new SecureHttpClientHandler(null);
+// ... rest of the code
+```
+
+## Error Messages / Stack Trace
+
+```
+Paste any error messages or stack traces here
+```
+
+## Additional Context
+
+Add any other context about the problem here (network environment, proxy settings, certificate details, etc.).
+
+## Workaround
+
+If you've found a workaround, please describe it here.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,48 @@
+---
+name: Feature Request
+about: Suggest a new feature or enhancement
+title: '[FEATURE] '
+labels: enhancement
+assignees: ''
+---
+
+## Feature Description
+
+A clear and concise description of the feature you'd like to see.
+
+## Problem or Use Case
+
+Describe the problem this feature would solve or the use case it would enable.
+
+## Proposed Solution
+
+Describe how you envision this feature working. Include code examples if possible.
+
+```csharp
+// Example usage of the proposed feature
+var handler = new SecureHttpClientHandler(null);
+handler.ProposedNewFeature(...);
+```
+
+## Alternatives Considered
+
+Describe any alternative solutions or features you've considered.
+
+## Platform Support
+
+Which platforms should this feature support?
+
+- [ ] Android
+- [ ] iOS
+- [ ] Windows/.NET
+- [ ] All platforms
+
+## Additional Context
+
+Add any other context, screenshots, or examples about the feature request here.
+
+## Implementation Willingness
+
+- [ ] I'm willing to implement this feature and submit a PR
+- [ ] I'm willing to help test this feature
+- [ ] I'm just suggesting the feature

.github/ISSUE_TEMPLATE/question.md

@@ -0,0 +1,36 @@
+---
+name: Question
+about: Ask a question about usage or functionality
+title: '[QUESTION] '
+labels: question
+assignees: ''
+---
+
+## Question
+
+What would you like to know?
+
+## Context
+
+Provide any relevant context about what you're trying to accomplish.
+
+## What I've Tried
+
+Describe what you've already tried or researched.
+
+## Code Sample (if applicable)
+
+```csharp
+// Your current code
+```
+
+## Platform
+
+- [ ] Android
+- [ ] iOS
+- [ ] Windows/.NET
+
+## Environment
+
+- **SecureHttpClient Version**: (e.g., 2.4.3)
+- **Target Framework**: (e.g., net10.0)