Added contributing.md

Author: cferdinandi

CONTRIBUTING.md

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+# How to contribute
+
+I'm delighted that you're helping make this open source project better. Here are a few quick guidelines to make this an easier and better process for everyone.
+
+
+
+## Reporting a bug
+
+First, **make sure the bug hasn't already been reported** by searching GitHub's issues section.
+
+If no existing issue exists, go ahead and create one. **Please be sure to include all of the following:**
+
+1. A clear, descriptive title (ie. "A bug" is *not* a good title).
+2. [A reduced test case.](https://css-tricks.com/reduced-test-cases/) In order to debug code issues, I need to see actual code in a browser.
+3. The browser and OS that you're using.
+
+
+
+## Asking a question
+
+Before asking, please **make sure the question hasn't already been asked** by searching GitHub's issues section.
+
+
+
+## Submitting a Pull Request
+
+Please make sure your code meets the following code standards:
+
+- Camel case for JavaScript variables.
+- [Object-Oriented CSS](http://www.slideshare.net/stubbornella/object-oriented-css) for CSS selectors.
+- Favor readable code over brevity. The build process will reduce size, so opt for readability. (ex. `var navigation` is better than `var n`)
+- Order CSS properties alphabetically.
+- Hard tabs.
+
+Before submitting, make sure that you've:
+
+- Updated the version number using semantic versioning.
+- Made your changes in the `src` folder.
+- Run the Gulp build to compile, minify, and update version numbers into the `dist` folder. If you cannot do this, please note this in the Pull Request.