added changelog && contribution info

Author: Patrice Brend'amour

CHANGELOG.md

@@ -0,0 +1,16 @@
+# Changelog
+All notable changes to this project will be documented in this file.
+
+## 0.0.1 - 2014-XX-XX
+### Added
+- Initial version
+
+### Deprecated
+- 
+
+### Removed
+- 
+
+### Fixed
+- 
+

CONTRIBUTING.md

@@ -0,0 +1,33 @@
+# Contributing
+
+We love pull requests. Here's a quick guide.
+
+Fork, then clone the repo:
+
+    git clone git@github.com:your-username/zencoder-java.git
+
+
+Make your change. Add tests for your change. 
+
+Push to your fork and [submit a pull request][pr].
+
+At this point you're waiting on us. We like to at least comment on pull requests
+within three business days (and, typically, one business day). We may suggest
+some changes or improvements or alternatives.
+
+Some things that will increase the chance that your pull request is accepted:
+
+* Write tests.
+* Use our [Checkstyle][style] style.
+* Write a [good commit message][commit].
+* Update [the changelog][changelog].
+
+
+If you have any more questions, [open an issue][issue] or send us an [email][email].
+
+[commit]: http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html
+[pr]: https://github.com/bitzeche/zencoder-java/compare/
+[issue]: https://github.com/bitzeche/zencoder-java/issues/
+[email]: mailto:p.brendamour@bitzeche.de
+[changelog]: https://github.com/bitzeche/zencoder-java/blob/master/CHANGELOG.md
+[style]: http://eclipse-cs.sourceforge.net