Add CONTRIBUTING file

Author: chadicus

CONTRIBUTING.md

@@ -0,0 +1,15 @@
+# Contribution Guidelines
+We welcome you to report [issues](https://github.com/dominionenterprises/mongo-queue-php/issues) or submit
+[pull requests](https://github.com/dominionenterprises/mongo-queue-php/pulls).  While the below guidelines are necessary to get code merged, you can
+submit pull requests that do not adhere to them and we will try to take care of them in our spare time.  We are a smallish group of developers,
+though, so if you can make sure the build is passing 100%, that would be very useful.
+
+We recommend including details of your particular usecase(s) with any issues or pull requests.  We love to hear how our libraries are being used
+and we can get things merged in quicker when we understand its expected usage.
+
+## Building
+Our [build](build.php) runs the code through the [PSR2 coding standard](http://www.php-fig.org/psr/psr-2/) and through our
+test suite.  Failures in either will keep us from merging the pull request.  The test suite MUST have 100% code coverage in the report.
+
+## Travis CI
+Our [Travis build](https://travis-ci.org/dominionenterprises/mongo-queue-php) executes the build above against pull requests.