feat: Enhance README with badges and remove placeholder

This commit updates the `README.md` to include several new badges for Jetpack Compose, Kotlin, GitHub author profile, project stars, and issues. It also removes a placeholder comment related to a GitHub profile link.

Key changes:
- Added badges for:
    - Jetpack Compose
    - Kotlin
    - GitHub Author Profile (@cavin-macwan)
    - GitHub Stars
    - GitHub Issues
- Removed the placeholder comment `*(Replace \`your-username\` with your GitHub profile link)*`.