[feat]: Add a splash screen for the app.

[theayushyadav11]

Problem:
Currently, the app launches directly into the main screen without a splash screen, which results in a sudden transition. A splash screen can improve the user experience by providing a smoother startup and reinforcing branding.

Expected Solution:

• Implement a splash screen that appears when the app is launched.
• Display the app logo and name for a brief duration (e.g., 2-3 seconds) before navigating to the main screen.

Steps to Implement:

1. Create a SplashActivity .
2. Set it as the launcher activity in AndroidManifest.xml.
3. Display the app logo and branding during the splash duration.
4. Navigate to the main activity after the splash screen.

Acceptance Criteria:

• The splash screen appears when the app is launched.
• The app logo and branding are displayed properly.
• The transition from splash to main screen is smooth and without lag.
• The implementation follows best practices (avoiding unnecessary delays).