fix(docs): Improve setup docs

closes INT-149

Author: imlucas

README.md

@@ -2,7 +2,13 @@
 
 Explore your MongoDB.
 
-<dl>
-  <dt><a href="#{url}">#{title}</a></dt>
-  <dd>#{description}</dd>
-</dl>
+## Developing
+
+1. Follow the setup instructions for [OSX][setup-osx], [Windows][setup-windows] or [Linux][setup-linux].
+2. Clone this repo
+3. Run `npm install` to install dependencies
+4. Run `npm start` to launch
+
+[setup-osx]: https://github.com/mongodb-js/mongodb-js/blob/master/docs/setup.md#osx-setup
+[setup-windows]: https://github.com/mongodb-js/mongodb-js/blob/master/docs/setup.md#windows-setup
+[setup-linux]: https://github.com/mongodb-js/mongodb-js/blob/master/docs/setup.md#linux-setup