Add contributing information

Author: englercj

CONTRIBUTING.md

@@ -0,0 +1,62 @@
+# How to contribute
+
+It is essential to the development of pixi.js that the community is empowered
+to make changes and get them into the library. Here are some guidlines to make
+that process silky smooth for all involved.
+
+## Reporting issues
+
+To report a bug, request a feature, or even ask a question, make use of the GitHub Issues
+section for [pixi.js][0]. When submitting an issue please take the following steps:
+
+1. **Seach for existing issues.** Your question or bug may have already been answered or fixed,
+be sure to search the issues first before putting in a duplicate issue.
+
+2. **Create an isolated and reproducible test case.** If you are reporting a bug, make sure you
+also have a minimal, runnable, code example that reproduces the problem you have.
+
+3. **Include a live example.** After narrowing your code down to only the problem areas, make use
+of [jsFiddle][1], [jsBin][2], or a link to your live site so that we can view a live example of the problem.
+
+4. **Share as much information as possible.** Include browser version affected, your OS, version of
+the library, steps to reproduce, etc. "X isn't working!!!1!" will probably just be closed.
+
+
+## Making Changes
+
+To setup for making changes you will need node.js, and grunt installed. You can download node.js
+from [nodejs.org][3]. After it has been installed open a console and run `npm i -g grunt-cli` to
+install the global `grunt` executable.
+
+After that you can clone the pixi.js repository, and run `npm i` inside the cloned folder.
+This will install dependencies necessary for building the project. Once that is ready, make your
+changes and submit a Pull Request. When submitting a PR follow these guidlines:
+
+- **Send Pull Requests to the `dev` branch.** All Pull Requests must be sent to the `dev` branch,
+`master` is the latest release and PRs to that branch will be closed.
+
+- **Ensure changes are jshint validated.** After making a change be sure to run the build process
+to ensure that you didn't break anything. You can do this with `grunt && grunt test` which will run
+jshint, rebuild, then run the test suite.
+
+- **Never commit new builds.** When making a code change, you should always run `grunt` which will
+rebuild the project, *however* please do not commit these new builds or your PR will be closed.
+
+- **Only commit relevant changes.** Don't include changes that are not directly relevant to the fix
+you are making. The more focused a PR is, the faster it will get attention and be merged. Extra files
+changing only whitespace or trash files will likely get your PR closed.
+
+## Quickie Code Style Guide
+
+- Use 4 spaces for tabs, never tab characters.
+
+- No trailing whitespace, blank lines should have no whitespace.
+
+- Always favor strict equals `===` unless you *need* to use type coercion.
+
+- Follow conventions already in the code, and listen to jshint.
+
+[0]: https://github.com/GoodBoyDigital/pixi.js/issues
+[1]: http://jsfiddle.net
+[2]: http://jsbin.com/
+[3]: http://nodejs.org

README.md

@@ -69,6 +69,9 @@ last 2 examples and allowing us to share the source code :)
 Want to be part of the pixi.js project? Great! All are welcome! We will get there quicker together :)
 Whether you find a bug, have a great feature request or you fancy owning a task from the road map above feel free to get in touch.
 
+Make sure to read the [Contributing Guide](https://github.com/GoodBoyDigital/pixi.js/blob/master/CONTRIBUTING.md)
+before submitting changes.
+
 ### How to build ###
 
 PixiJS is build with Grunt. If you don't already have this, go install Node and NPM then install the Grunt Command Line.