Update README.md

Author: nodkz

README.md

@@ -4,7 +4,8 @@ This is a plugin for [graphql-compose](https://github.com/nodkz/graphql-compose)
 
 Example
 =======
-Can be found here https://github.com/nodkz/graphql-compose-mongoose-example
+Live demo: [https://graphql-compose-mongoose.herokuapp.com/](https://graphql-compose-mongoose.herokuapp.com/?query=%7B%0A%20%20userMany(limit%3A%205)%20%7B%0A%20%20%20%20_id%0A%20%20%20%20name%0A%20%20%20%20age%0A%20%20%7D%0A%7D)
+Source code: https://github.com/nodkz/graphql-compose-mongoose-example
 ```js
 import mongoose from 'mongoose';
 import mongooseToTypeComposer from 'graphql-compose-mongoose';