Add CONTRIBUTING.md. Fixes #170

CONTRIBUTING.md

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+# Contributing
+
+ * All pull requests must be made against the `dev` branch
+ * Complete documentation is available at http://taskboard.matthewross.me/docs/
+ * In fact, more information about TaskBoard in general is available at http://taskboard.matthewross.me/
+
+ ## Versioning
+
+To clarify for myself and others, here is the versioning scheme used by Taskboard as of version v0.3.0 (for versions prior, it was basically just make it up as I went along):
+
+Versions are defined in three parts; major, minor and revision. For example, v0.3.0 is Major 0, Minor 3, Revision 0.
+
+ * Major version numbers change in two cases:'
+ * v1.0.0 is when I feel TaskBoard is *Production Ready*
+ * When changes are made that add significant new features or break some form of compatibility with previous versions (e.g. requiring a new database)
+
+Minor version numbers change when a chosen set of changes are ready for use. The changes are issues reported by users or added by myself for tracking planned features.
+
+Revision version numbers change when a bug is reported that needs to be fixed before another minor version is released.