Add git information to readme

[jkinsky]

Existing Sample Changes

Description

Added information on cloning stable version of repo.

Fixes Issue#

External Dependencies

List any external dependencies created as a result of this change.

Type of change

Please delete options that are not relevant. Add a 'X' to the one that is applicable.

• [X] Documentation change

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• [x] VSCode