Adds CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing
+
+If you find this app useful, please consider contributing to its
+development. There are plenty of wish-list features in the
+[bug tracker][bugtracker].
+
+To get started, fork the repo, have a look around, and try building
+the gem:
+
+    gem build todo-curses.gemspec
+
+This should succeed.
+
+Then, [find an issue][bugtracker] (or log one) and add a comment saying that
+you'd like to work on it.
+(So that we don't end up with duplicate effort.)
+
+## Developing
+
+To make life a little easier, I've set up some Rake tasks.
+If you create a `todo.txt.bak` file, you can run `rake reset`, which
+will copy it into `todo.txt`. Then you can run `rake` and it will
+open the app on this file.
+
+## Submitting
+
+Once it looks good, write up a [good commit message][commit].
+Push to your fork and submit a pull request. Be sure to mention
+the issue number you were working on in the bug tracker so that
+they're linked up.
+
+[bugtracker]: https://github.com/lorentrogers/jekylljournal/issues
+[commit]: http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html
+