added editable mode install command in redme

README.md

@@ -202,6 +202,7 @@ cd backend
 python -m venv .venv
 source .venv/bin/activate  # On Windows: .venv\Scripts\activate
 pip install -r requirements.txt
+pip install -e .
 uvicorn app.main:app --reload
 ```
 
@@ -279,4 +280,4 @@ Contributions are welcome! Please feel free to submit a Pull Request.
 
 ## 📧 Contact
 
-For questions or feedback, please open an issue on GitHub.
+For questions or feedback, please open an issue on GitHub.