Add CONTRIBUTING.md with mention of contributors agreement.

Jesse White · Jesse White · commit f199b3129fb1 · 2016-03-17T08:39:10.000-07:00
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
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+# Contributing to Newts
+Thanks for your interest in contributing to Newts!
+
+The basic process:
+- Sign a OpenNMS CLA. See [Contributor Agreement](https://www.opennms.org/wiki/Contributor_Agreement)
+- Create a git topic branch for your patch and push it to GitHub
+- Open a pull request
