Add CONTRIBUTING.md

Author: seancorfield

CONTRIBUTING.md

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+This is a [Clojure contrib] project.
+
+Under the Clojure contrib [guidelines], this project cannot accept
+pull requests. All patches must be submitted via [JIRA].
+
+See [Contributing] and the [FAQ] on the Clojure development [wiki] for
+more information on how to contribute.
+
+[Clojure contrib]: http://dev.clojure.org/display/doc/Clojure+Contrib
+[Contributing]: http://dev.clojure.org/display/community/Contributing
+[FAQ]: http://dev.clojure.org/display/community/Contributing+FAQ
+[JIRA]: http://dev.clojure.org/jira/browse/TMACRO
+[guidelines]: http://dev.clojure.org/display/community/Guidelines+for+Clojure+Contrib+committers
+[wiki]: http://dev.clojure.org/