dev: updates README.md

Author: yuriyaran

README.md

@@ -80,6 +80,7 @@ Based on my experience, investing efforts into learning and implementing the lat
    - I decided to use minimal design, no fancy looks, no external libraries, just plain functionality, and minimum CSS
    - each repository row is clickable and behaves like a drawer for the row below with a branches list (basic animation included)
    - implemented responsive design: supports desktop and mobile views
+   - icons are taken from [AmpWhat](https://www.amp-what.com/)
 
 8. **App functionality decisions**
    1. No excess, duplicate, or unnecessary API calls: