Added CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing
+
+We love pull requests from everyone. Please be nice and forgive us
+if we can't process your request right away.
+
+Fork, then clone the repo:
+
+    git clone git@github.com:your-username/Jabit.git
+
+Make sure the tests pass:
+
+    ./gradlew test
+
+Make your change. Add tests for your change. Make the tests pass:
+
+    ./gradlew test
+
+Push to your fork and [submit a pull request][pr].
+
+[pr]: https://github.com/Dissem/Jabit/compare/
+
+Unfortunately we can't always answer right away, so we ask you to have
+some patience. Then we may suggest some changes or improvements or
+alternatives.