Merge pull request #542 from nikital/nikital-ugit

Add link to "ugit: Building Git Yourself"

README.md

@@ -218,6 +218,7 @@ It's a great way to learn.
 * [**JavaScript**: _Build GIT - Learn GIT_](https://kushagra.dev/blog/build-git-learn-git/)
 * [**Python**: _Just enough of a Git client to create a repo, commit, and push itself to GitHub_](https://benhoyt.com/writings/pygit/)
 * [**Python**: _Write yourself a Git!_](https://wyag.thb.lt/)
+* [**Python**: _ugit: Learn Git Internals by Building Git Yourself_](https://www.leshenko.net/p/ugit/)
 * [**Ruby**: _Rebuilding Git in Ruby_](https://robots.thoughtbot.com/rebuilding-git-in-ruby)
 
 #### Build your own `Network Stack`