Added find-project-root CLI usage link

Author: adamlui

docs/README.md

@@ -268,6 +268,7 @@
 <br>[Install](https://github.com/adamlui/python-utils/tree/main/find-project-root/#installation) /
 [Readme](https://github.com/adamlui/python-utils/tree/main/find-project-root/#readme) /
 [API usage](https://github.com/adamlui/python-utils/tree/main/find-project-root/#api-usage) /
+[CLI usage](https://github.com/adamlui/python-utils/tree/main/find-project-root/#command-line-usage) /
 [Discuss](https://github.com/adamlui/python-utils/discussions)
 
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