Add Branch Scanning

[JennieOhyoung]

I made some changes to this script because:

1. The commit check is only looking at the default branch and not checking other branches. I added the '-b' option to enable branch scanning.
2. Some customers are unsure how to get started, so I added a doc link on how to generate a token and specified the date format.

[JennieOhyoung]

Note: please allow me to do the merging after review. I have a customer currently using the script off of this branch.

[primetheus]

@JennieOhyoung this is really great! Can you update it to use spaces instead of tabs? The formatting of the additions makes some of the additions a bit hard to follow 🙏 🙇