Add the list of backers & sponsors

Author: koistya

README.md

@@ -15,6 +15,8 @@ design patterns.
 
 <p align="center"><strong>View</strong> <a href="https://firebase.reactstarter.com">online demo</a> (<a href="https://firebase.reactstarter.com/graphql">API</a>, <a href="https://firebase.reactstarter.com/graphql/model">data model</a>) &nbsp;|&nbsp; <strong>Follow us</strong> on <a href="https://twitter.com/ReactStarter">Twitter</a> &nbsp;|&nbsp; <strong>Get FREE support</strong> on <a href="https://discord.gg/2nKEnKq">Discord</a> &nbsp;|&nbsp; <a href="https://angel.co/company/kriasoft/jobs/"><strong>We're hiring!</strong></a></p>
 
+<a href="https://reactstarter.com/s/1"><img src="https://reactstarter.com/s/1.png" height="60" /></a>&nbsp;&nbsp;<a href="https://reactstarter.com/s/2"><img src="https://reactstarter.com/s/2.png" height="60" /></a>&nbsp;&nbsp;<a href="https://reactstarter.com/s/3"><img src="https://reactstarter.com/s/3.png" height="60" /></a>
+
 ---
 
 This project was bootstrapped with [React Starter Kit for Firebase][rfs] by [Kriasoft][kriasoft].
@@ -177,6 +179,10 @@ repository, otherwise your project may differ too much from the base/upstream re
 Alternatively, you can use a folder diff tool like [Beyond Compare][bc] for keeping your project
 up to date with the base repository._
 
+### Backers
+
+<a href="https://reactstarter.com/b/1"><img src="https://reactstarter.com/b/1.png" height="60" /></a>&nbsp;&nbsp;<a href="https://reactstarter.com/b/2"><img src="https://reactstarter.com/b/2.png" height="60" /></a>&nbsp;&nbsp;<a href="https://reactstarter.com/b/3"><img src="https://reactstarter.com/b/3.png" height="60" /></a>&nbsp;&nbsp;<a href="https://reactstarter.com/b/4"><img src="https://reactstarter.com/b/4.png" height="60" /></a>&nbsp;&nbsp;<a href="https://reactstarter.com/b/5"><img src="https://reactstarter.com/b/5.png" height="60" /></a>&nbsp;&nbsp;<a href="https://reactstarter.com/b/6"><img src="https://reactstarter.com/b/6.png" height="60" /></a>&nbsp;&nbsp;<a href="https://reactstarter.com/b/7"><img src="https://reactstarter.com/b/7.png" height="60" /></a>&nbsp;&nbsp;<a href="https://reactstarter.com/b/8"><img src="https://reactstarter.com/b/8.png" height="60" /></a>
+
 ### How to Contribute
 
 Anyone and everyone is welcome to [contribute](https://github.com/kriasoft/react-firebase-starter/wiki/Contributing) to this project. The best way to