Add heroku deployment button

Author: simonfranzen

README.md

@@ -10,7 +10,11 @@ This is a boilerplate to build your next Saas product. It's a RubyOnRails 5 API
 
 ## Quick start
 
-Clone the repo:
+[![Deploy](https://www.herokucdn.com/deploy/button.svg)](https://heroku.com/deploy?template=https://github.com/heroku/node-js-sample)
+
+or
+
+clone the repo:
 
 ```sh
 git clone my-saas-backend https://github.com/zauberware/rails-devise-graphql
@@ -77,6 +81,9 @@ TBD: rspect
 ### 8. Deployment
 The project runs on every webhoster with ruby installed. The current demo was deployed to an heroku dyno with a Postgresql database as the only resource.
 
+[![Deploy](https://www.herokucdn.com/deploy/button.svg)](https://heroku.com/deploy?template=https://github.com/heroku/node-js-sample)
+
+
 **Make sure all ENV vars are set and the database settings are valid.**
 
 ### 9. Frontend