Added contributing document;

CONTRIBUTING.md

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+# Contributing
+
+Here are the guidelines and required reading for contributing.
+
+## Getting Started
+
+### Prerequisites
+1. [Node.js](https://nodejs.org/en/)
+2. [VS Code](https://code.visualstudio.com/) (optional but recommended)
+
+### Setting up the repo
+1. Fork the repo and clone to your work environment
+2. Run `npm i` to install required dev dependencies
+3. Run `npm i -g coffeescript@1.6.3` then run `coffee -c Gruntfile.coffee`
+5. Run `grunt` to build the project
+
+### Running Tests
+
+After completing the 'Getting Started' section,
+1. Run `webdriver-manager update` to ensure the webdriver for selenium (used by protractor) is up-to-date
+2. Open an additional terminal and run `node e2e/express.js` to start serving the test pages
+3. In the original terminal, run `protractor e2e/conf.js`
+
+## Pull Request Process
+
+1. Ensure any generated files are ignored.
+2. Update the README.md and other documentation as it relates to your changes.
+3. Rebase your branch on the latest version of the branch on which it is based. This may need to happen multiple times as other PRs are merged.