Work out a process for versioning and releasing unity-sds-client

[rtapella]

• with several teams contributing to unity-sds-client, how do we manage version numbers?
• who owns the release to pypi?
• how do we tag development releases in pypi?

[rtapella]

Brian to start writing out a process
Also manage stale PRs for unity-sds-client which will help with managing versions and the timing of Merges

[rtapella]

Will make this process sync up with SLIM: NASA-AMMOS/slim#188

[rtapella]

process is now documented