Add butterfly video
Add butterfly video

Asset is CC0 Creative Commons, Free for commercial use, No attribution required:
https://pixabay.com/en/videos/flowers-butterfly-nature-garden-5473/
flutter/assets-for-api-docs,flutter/assets-for-api-docs,flutter/assets-for-api-docs,flutter/assets-for-api-docs,flutter/assets-for-api-docs,flutter/assets-for-api-docs