README: add note about use of libgit2 C library
Closes
@@ -34,7 +34,7 @@ to replace (rare in English). The project is called "Jujutsu" because it matches
Jujutsu has two backends. One of them is a Git backend (the other is a native
one). This lets you use Jujutsu as an alternative interface to Git. The commits
you create will look like regular Git commits. You can always switch back to
-Git.
+Git. The Git support uses the [libgit2](https://libgit2.org/) C library.
<a href="https://asciinema.org/a/DRCzktCyEAxH6j788ZDT6aSjS" target="_blank">
<img src="https://asciinema.org/a/DRCzktCyEAxH6j788ZDT6aSjS.svg" />
