Fork comparing CLI tool

### Is your feature request related to a problem? Please describe.
I'm trying to compare the changes between nvidia's fork of the Godot engine and what they've done to incorporate support for RTX rendering, but making a pull request is kind of clunky to view on the webui.

### Describe the solution you'd like
A way to view diff files quickly between files in a repo

### Describe alternatives you've considered
NIL