Add "Watch Ads to Earn Coins" Feature

I'm looking to enhance my Flutter app by adding a "Watch Ads to Earn Coins" feature.

Requirements:
- Integrate video ads using Unity Ads
- Implement a coin reward system for users watching ads
- Ensure smooth UI/UX and functionality
Note: we have wallet feature

Ideal Skills & Experience:
- Proficiency in Flutter
- Experience with Unity Ads integration
- Strong background in UI/UX design and app functionality

Looking forward to your proposals!