Updates README.md

Adds minimal example

Author: DevanB

README.md

@@ -8,7 +8,7 @@
 
 **Select a boilerplate and follow the instructions in the belonging README to get started:**
 
-- `minimal` (_coming soon_): Minimal boilerplate with basic "Hello World" functionality
+- [`minimal`](./minimal): Minimal boilerplate with basic "Hello world" functionality
 - [`basic`](./basic): Basic boilerplate based on a simple data model and with a GraphQL database
 - `advanced` (_coming soon_): Advanced boilerplate with a GraphQL database, authentication and realtime subscriptions