feat: add basic chat application frontend with message sending and loading functionality

- Implemented message sending and loading in app.js
- Created index.html for the chat interface
- Added styles in style.css for a better user experience
- Included package.json for project metadata

Author: enjoy15

.gitignore

@@ -0,0 +1,18 @@
+# Dependencies
+node_modules/
+chat-app/**/node_modules/
+
+# Logs
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+
+# Environment variables
+.env
+.env.*
+!.env.example
+
+# OS files
+.DS_Store
+Thumbs.db