Add guide for releasing to Google Cloud Platform

Summary of changes

This PR adds a simple guide of deploying a release to a VM on Google Cloud Platform.

Checklist

[ ] New functions have typespecs, changed functions were updated
[ ] Same for documentation, including moduledocs
[ ] Tests were added or updated to cover changes
[x] Commits were squashed into a single coherent commit

Licensing/Copyright

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I certify that I own, and have sufficient rights to contribute, all source code and related material intended to be compiled or integrated with the source code for Distillery (the "Contribution"). My Contribution is licensed under the MIT License.

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bitwalker / distillery