Add release output information to README/documentation

[alexjhawk]

hms-networks/sc-ewon-flexy-extensions-lib#56, @it-hms:

Add directions to the readme for contributing a release. This includes the following steps:

• do not name feature branch release/vX.Y.Z. This will will be done by automation.
• ensure that CHANGELOG.MD has been updated
• last commit subject should be RELEASE: vX.Y.Z
• When PR is approved, delete feature branch(s). create tag from main branch.

git tag vX.Y.Z
git push vX.Y.Z 

[alexjhawk]

Replicating issue hms-networks/sc-ewon-flexy-extensions-lib#56 from https://github.com/hms-networks/sc-ewon-flexy-extensions-lib.

This suggested change also applies to the development environment documentation provided in this repository. Projects based on this starter project are/should be linked to this repository for development environment documentation. This will clarify the process for generating a release.