Add contributors section

Author: jihchi

README.md

@@ -38,3 +38,11 @@ npm start
 Then open http://localhost:3000 to see your app.
 
 When you’re ready to deploy to production, create a production build with `npm run build` and you will find result in folder `/dist`, after you created a production build, you can execute `npm run serve` to serve the folder.
+
+## Contributors
+
+Many thanks for your help!
+
+<a href="https://github.com/jihchi/rescript-react-realworld-example-app/graphs/contributors">
+  <img src="https://contributors-img.web.app/image?repo=jihchi/rescript-react-realworld-example-app" />
+</a>