Added Code of Conduct.

Author: photonstorm

CODE_OF_CONDUCT.md

@@ -0,0 +1,13 @@
+# Contributor Code of Conduct
+
+As contributors and maintainers of this project, we pledge to respect all people who contribute through reporting issues, posting feature requests, updating documentation, submitting pull requests or patches, and other activities.
+
+We are committed to making participation in this project a harassment-free experience for everyone, regardless of level of experience, gender, gender identity and expression, sexual orientation, disability, personal appearance, body size, race, age, or religion.
+
+Examples of unacceptable behavior by participants include the use of sexual language or imagery, derogatory comments or personal attacks, trolling, public or private harassment, insults, or other unprofessional conduct.
+
+Project maintainers have the right and responsibility to remove, edit, or reject comments, commits, code, wiki edits, issues, and other contributions that are not aligned to this Code of Conduct. Project maintainers who do not follow the Code of Conduct may be removed from the project team.
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be reported by opening an issue or contacting one or more of the project maintainers.
+
+This Code of Conduct is adapted from the [Contributor Covenant](http:contributor-covenant.org), version 1.0.0, available at [http://contributor-covenant.org/version/1/0/0/](http://contributor-covenant.org/version/1/0/0/)

CONTRIBUTING.md

@@ -2,6 +2,7 @@
 
 It's important to us that you feel you can contribute towards the evolution of Phaser. This can take many forms: from helping to fix bugs or improve the docs, to adding in new features to the source. This guide should help you in making that process as smooth as possible.
 
+Before contributing, please read the [code of conduct](https://github.com/photonstorm/phaser/blob/master/CODE_OF_CONDUCT.md).
 
 ##Reporting issues
 

README.md

@@ -375,6 +375,8 @@ We now have a full [Contributors Guide][contribute] which goes into the process
 
 - Before submitting a Pull Request please run your code through [JSHint](http://www.jshint.com/) to check for stylistic or formatting errors. To use JSHint, run `grunt jshint`. This isn't a strict requirement and we are happy to receive Pull Requests that haven't been JSHinted, so don't let it put you off contributing, but do know that we'll reformat your source before going live with it.
 
+- Before contributing, please read the [code of conduct](https://github.com/photonstorm/phaser/blob/master/CODE_OF_CONDUCT.md).
+
 [![Build Status](https://travis-ci.org/photonstorm/phaser.png?branch=dev)](https://travis-ci.org/photonstorm/phaser)
 
 ![div](http://phaser.io/images/div3.png)