Add initial CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing to Pivotal Projects
+
+We’d love to accept your patches and contributions to this project. Please review the following guidelines you'll need to follow in order to make a contribution.
+
+## Contributor License Agreement
+
+All contributors to this project must have a signed Contributor License Agreement (**"CLA"**) on file with us. The CLA grants us the permissions we need to use and redistribute your contributions as part of the project; you or your employer retain the copyright to your contribution. Head over to https://cla.pivotal.io/ to see your current agreement(s) on file or to sign a new one.
+
+We generally only need you (or your employer) to sign our CLA once and once signed, you should be able to submit contributions to any Pivotal project. 
+
+Note: if you would like to submit an "_obvious fix_" for something like a typo, formatting issue or spelling mistake, you may not need to sign the CLA. Please see our information on [obvious fixes](https://cla.pivotal.io/about#obvious-fix) for more details.