docs: add ADR for updating user groups based on criteria definitions#13

mariajgrimaldi wants to merge 7 commits intoMJG/runtime-architecture-for-evaluation-and-extension-adropenedx/openedx-user-groups:MJG/runtime-architecture-for-evaluation-and-extension-adrfrom

MJG/refreshment-and-consistency-adropenedx/openedx-user-groups:MJG/refreshment-and-consistency-adrCopy head branch name to clipboard