improved read me to activeGroupsWithoutMembers

[ChaseMillers]

PR Description:

I only updated the README.mb file linked to the activeGroupsWithoutMembers.js file.
This new README.md explains more about what the actual .js file does as well as how to use.
The .js code itself doesn't have many comments to explain, so this change seemed helpful and appropriate.

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[ravichandra1998g]

Hello @ChaseMillers

Thank you for your efforts in updating the README file.
That PR was a low-effort one, and the code itself was quite simple, using GlideAggregate. While the detailed README you added was certainly helpful, those simple lines were sufficient as well for a simple code.

Thank you!