message: docs: Adding Sunbird to users list
diff: @@ -118,6 +118,7 @@ Join our growing community!
  - [Brilliant.org](https://brilliant.org/)
  - [Udemy](https://www.udemy.com/) [@sungjuly]
  - [VIPKID](https://www.vipkid.com.cn/) [@illpanda]
  +- [Sunbird](https://www.sunbird.org/) [@eksteporg]
  ### Energy
  - [Airboxlab](https://foobot.io) [@antoine-galataud]
  