DOCSP-37736: Adding FastAPI App Generator to Tools page (#122)

(cherry picked from commit b3fd18e)

Author: mayaraman19

source/tools.txt

@@ -119,6 +119,10 @@ Flask
 Other Tools
 ~~~~~~~~~~~
 
+- `Full Stack FastAPI App Generator <https://github.com/mongodb-labs/full-stack-fastapi-mongodb>`__
+  enables you to quickly spin up a full-stack application
+  that integrates FastAPI, React, and MongoDB.
+
 - `Log4Mongo <https://github.com/log4mongo/log4mongo-python>`__ is a flexible
   Python logging handler that can store logs in MongoDB by using normal and capped
   collections.