Updates CONTRIBUTING.md for runing with Docker

docs/CONTRIBUTING.md

@@ -32,6 +32,12 @@ An easier solution would be to use Docker.
 1. Run `npm start` to start telescope.
 *If you get a series of errors, you may have to start redis-server depending on your installation configuration, do this by running the command `redis-server` in a seperate command window).*
 
+**OR Run With Docker**
+
+    docker-compose up --build
+
+telescope should be running [here](http://localhost:3000)
+
 ## MVP Features
 These features are the basic elements of what we are trying to accomplish, and are explained in further detail in [overview.md](https://github.com/Seneca-CDOT/telescope/blob/master/docs/overview.md#mvp-features):