docs: mention Breezy as a similar tool
Closes
@@ -15,3 +15,6 @@ Similar tools:
we do simply as a consequence of making the working copy a commit).
* [Pijul](https://pijul.org/): Architecturally quite different from Jujutsu,
but its "first-class conflicts" feature seems quite similar to ours.
+* [Breezy](https://www.breezy-vcs.org/): Another VCS that's similar in that it
+ has multiple storage backends, including its own format as well as .git
+ support.
