Update app.py

app.py

@@ -123,3 +123,8 @@ def main():
 # Run the app
 if __name__ == "__main__":
     main()
+python -m venv venv
+source venv/bin/activate  # For macOS/Linux
+venv\Scripts\activate     # For Windows
+pip install streamlit sympy
+pip freeze > requirements.txt