youtube links and contribution info

Author: adrienjoly

README.md

@@ -4,6 +4,24 @@ A minimal Chrome Extension that provides direct URLs to your emails, from Google
 
 Install from Chrome Web Store: [Permalinks for Google Inbox](https://chrome.google.com/webstore/detail/eijfpfnadnijllpfdkdikfamdijafala)
 
-### Demo
+## Demo
 
 ![screenshot permalinks for google inbox](docs/assets/screenshot-inbox-permalinks.png)
+
+## Watch how I made that extension
+
+I made this extension in one hour, live on Twitch, LiveEdu and Youtube.
+
+You can watch the videos on Youtube:
+
+- [part 1](https://www.youtube.com/watch?v=SUQQwr7etzo)
+- [part 2](https://www.youtube.com/watch?v=lHzsZ3lpy5w)
+
+## Contribute
+
+Pull requests are welcome and appreciated.
+
+Especially:
+
+- to fix bugs;
+- to improve the UI.