docs: add issue templates

Author: SeungrokYoon

.github/ISSUE_TEMPLATE/TODO_TEMPLATE.md

@@ -0,0 +1,9 @@
+---
+name: Todo
+about: Suggest further todos for practicing algorithms
+title: ''
+labels: ''
+assignees: ''
+---
+
+# Todo

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,5 @@
+blank_issues_enabled: false
+contact_links:
+  - name: Todo Issues
+    url: 'www.google.com'
+    about: Please add further todos for practice algorithms

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,20 @@
+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.