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 🙏 🙇

[primetheus]

the suggested changes feature only allows one line at a time, but lines 119-145, as well as 266-269 have formatting issues as well. Might be a bit of a nit-pick, but helps with the readability when it's all formatted the same 🙇

[jonico]

@JennieOhyoung: looks as if indenting is broken here

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