feat: initialize Angular application with basic structure and configuration

- Add app configuration in app.config.ts
- Create main application component with routing support
- Implement basic HTML structure in app.html
- Add global styles and Tailwind CSS integration
- Set up routing with an empty routes array
- Create unit tests for the app component
- Add TypeScript configuration files for the application and tests
- Include index.html as the entry point for the application
- Bootstrap the application in main.ts

.postcssrc.json

@@ -0,0 +1,5 @@
+{
+  "plugins": {
+    "@tailwindcss/postcss": {}
+  }
+}