Adding author and last updated ts

Author: justinjohnson-dev

projects/url_shortener/README.md

@@ -26,4 +26,8 @@ I built code quality tools into project (linting, formatting, type annotation ch
 1. `ruff check .` - linter
 2. `ruff check --fix` - fix linting
 3. `ruff format` - formatting
-4. `mypy .` - type annotation checking
+4. `mypy .` - type annotation checking
+
+
+Author: [justinjohnson-dev](https://github.com/justinjohnson-dev)
+Last Update: 05/25/2024