Create CONTRIBUTING.md

CONTRIBUTING.md

+# Guide to contributing
+
+Please read this if you intend to contribute to the project.
+
+## Legal stuff
+
+Apologies in advance for the extra work required here - this is necessary to comply with the Eclipse Foundation's
+strict IP policy.
+
+Please also read [this](http://wiki.eclipse.org/Development_Resources/Contributing_via_Git).
+
+In order for any contributions to be accepted, you MUST do the following things:
+
+* Sign the [Eclipse Contributor Agreement](http://www.eclipse.org/legal/ECA.php).
+To sign the Eclipse Contributor Agreement you need to:
+
+  * Obtain an Eclipse Foundation account. Anyone who currently uses Eclipse Bugzilla or Gerrit already has an Eclipse account.
+If you don’t, you need to [register](https://dev.eclipse.org/site_login/createaccount.php).
+
+  * Login to the [projects portal](https://projects.eclipse.org/), select “My Account”, and then the “Eclipse ECA” tab.
+
+* Add your GitHub ID in your Eclipse Foundation account. Find this option in the "Account Settings" tab.
+
+* "Sign-off" your commits
+
+Every commit you make in your patch or pull request MUST be "signed off".
+
+You do this by adding the `-s` flag when you make the commit(s), e.g.
+
+    git commit -s -m "Shave the yak some more"
+
+## Making your changes
+
+* Fork the repository on GitHub.
+* Create a new branch for your changes.
+* Make your changes.
+* Make sure you include tests.
+* Make sure the test suite passes after your changes.
+* Commit your changes into that branch.
+* Use descriptive and meaningful commit messages.
+* If you have a lot of commits, squash them into a single commit.
+* Make sure you use the `-s` flag when committing as explained above.
+* Push your changes to your branch in your forked repository.
+
+## Submitting the changes
+
+Submit a pull request via the normal GitHub UI.
+ 
+## After submitting
+
+* Do not use your branch for any other development, otherwise further changes that you make will be visible in the PR.
+
+# Credit
+
+This document was originally written by the ICE team at
+
+https://raw.githubusercontent.com/eclipse/ice/master/CONTRIBUTING.md
+
+We have shamelessly copied, modified and co-opted it for our own repo and we
+graciously acknowledge the work of the original authors.