update contributing

contributing.md

@@ -1,3 +1,32 @@
+## Getting Started
+
+1. Install dependencies
+
+ * Git (<http://git-scm.com>)
+ * Grunt (<http://gruntjs.com>)
+ * Node.js (<http://nodejs.org>)
+ * NPM (<http://npmjs.org>)
+ * Sass (<http://sass-lang.com>)
+
+1. Clone repository
+
+   ```bash
+   $ git clone git@github.com:milligram/milligram.git
+   $ cd milligram
+   ```
+
+1. Install node dependencies using npm
+
+   ```bash
+   $ npm install
+   ```
+
+1. Run 
+
+   ```bash
+   $ npm start
+   ```
+
 ## Contributing
 
 Help improve these docs. Open an [issue](https://github.com/milligram/milligram/issues/new) or submit a pull request.