Put link to documentation site in the README.md

Author: vojtapol

README.md

@@ -1,4 +1,4 @@
 # GraphQL Kickstart Documentation
 [![Build Status](https://travis-ci.org/graphql-java-kickstart/documentation.svg?branch=master)](https://travis-ci.org/graphql-java-kickstart/documentation)
 
-Documentation for GraphQL Kickstart projects.
+### [Documentation for GraphQL Kickstart projects.](https://www.graphql-java-kickstart.com/tools/)