Update README.md

README.md

@@ -19,6 +19,6 @@ https://docs.streamlit.io/library/get-started/installation
 ```shell
 $ python -m venv .venv
 $ source .venv/bin/activate
-$ pip install streamlit
-$ python3 app.py
+$ pip install -r requirements.txt
+$ streamlit run app.py
 ```