docs(readme): Add developer contributing documentation to README.

README.md

@@ -26,6 +26,53 @@ This web-based application is being developed with three characteristics in mind
 With Mozilla Advisor [Curtis Koenig](https://mozillians.org/en-US/u/curtisk/)
 and Professor [Dr. Pawan Lingras](http://cs.stmarys.ca/~pawan/)
 
+## Contributing
+
+Please use issue branches and submit [Pull Requests](https://help.github.com/articles/using-pull-requests) for review.  
+Your commit messages should [AngularJS Git Commit Message Conventions](https://docs.google.com/document/d/1QrDFcIiPjSLDn3EL15IJygNPiHORgU1_OOAqWjiDU5Y/edit).
+
+### Getting Started
+
+
+#### Installing Dependencies
+
+After cloning the repository in the location of your choice run the following commands in your Terminal:
+
+```
+npm install
+bower install
+```
+
+This will install your [Node.js](http://nodejs.org/) and [Bower](http://bower.io/) dependencies.
+
+We use [grunt-contrib-compass](https://github.com/gruntjs/grunt-contrib-compass)
+which requires you to have
+[Ruby](https://www.ruby-lang.org/en/downloads/),
+[Sass](http://sass-lang.com/guide),
+and [Compass](http://compass-style.org/install/) >=0.12.2 installed.
+
+Please verify you have those installed (see https://github.com/gruntjs/grunt-contrib-compass#compass-task)
+or you may receive the following error message when building:
+
+```
+Warning: Running "compass:dist" (compass) task
+Warning: You need to have Ruby and Compass installed and in your system PATH for this task to > work. More info: https://github.com/gruntjs/grunt-contrib-compass Use --force to continue.
+```
+
+#### Building
+
+Once you have the app dependencies installed you can start building the app.
+
+We use [Grunt](http://gruntjs.com/). Please verify you have it installed.
+
+Run `grunt` for building and `grunt serve` for previewing your app locally.
+
+#### Developing
+
+We recommend you use the [sub-generators provided](https://github.com/yeoman/generator-angular#generators)
+by [generator-angular](https://github.com/yeoman/generator-angular).  
+Remember to follow the proper commit messages conventions: [AngularJS Git Commit Message Conventions](https://docs.google.com/document/d/1QrDFcIiPjSLDn3EL15IJygNPiHORgU1_OOAqWjiDU5Y/edit).
+
 ## Links
 
 - [Mozilla Wiki Page](https://wiki.mozilla.org/Security/Mentorships/MWoS/2014/online_threat_modeling_tool)