Create CONTRIBUTING.md

Author: mikebell90

CONTRIBUTING.md

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+We welcome contributions to this project.
+
+1. Development of this project primarily is done on Macs (x64 and M1). However, this project should work fine in any standard Java environment with docker installed.
+2. New features or changes should be accompanied by tests.
+3. We are fans of clear and concise commentary and liberal usage of javadocs.
+4. We recommend, but do not require signing your commits.
+5. Minimal dependencies should be introduced into this project.
+
+Currently we've not granted anyone outside of OpenTable commit rights or rights to release to Nexus OSS. We would certainly reconsider the matter in the future,
+should significant community input occur.
+
+This is one of about 35 libraries we maintain internally for Java alone, so patience is appreciated when creating a PR.