Document the release process

[SteveLasker]

What is the areas you would like to add the new feature to?

Go-COSE Library

Is your feature request related to a problem?

We are currently working out of main, where all approved/merged updates are pushed to main. As a new release is queued, we stabilize out of main. This has served us well thus far. Open question:

• Do we anticipate stabilizing a release, while developing a new version concurrently? This may require a more complex branching strategy.
• Do we believe we can work around our stabilize in main process?

Either way, we should document the current working process.