updated readme

Author: Brandon Lei

README.md

@@ -11,6 +11,7 @@ This FastAPI backend handles speech-to-text, natural language processing, and te
 ├── main.py          # Main application file
 ├── test.py          # Test file generator
 ├── .env             # Environment variables
+├── requirements.txt # Required packages
 └── README.md        # This file
 ```