Add some CLO stuff (#158)

Signed-off-by: Doug Davis <dug@microsoft.com>

CONTRIBUTING.md

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+# Contributing to CloudEvents sdk-python
+
+:+1::tada: First off, thanks for taking the time to contribute! :tada::+1:
+
+We welcome contributions from the community! Please take some time to become
+acquainted with the process before submitting a pull request. There are just
+a few things to keep in mind.
+
+## Pull Requests
+
+Typically a pull request should relate to an existing issue. If you have
+found a bug, want to add an improvement, or suggest an API change, please
+create an issue before proceeding with a pull request. For very minor changes
+such as typos in the documentation this isn't really necessary.
+
+### Sign your work
+
+Each PR must be signed. Be sure your `git` `user.name` and `user.email` are configured
+then use the `--signoff` flag for your commits.
+
+```console
+git commit --signoff
+```

OWNERS

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+admins:
+  - grant
+  - denismakogon
+  - cumason123