Update README.md

README.md

 # kevin-ui
 
+
+To set up the project after cloning the repository: 
+
+1) Install Javascript dependencies:
+```
+cd kevin-ui
+npm i
+```
+
+2) Create Python virtual environment and install dependencies:
+```
+cd api
+python3 -m venv venv
+source venv/bin/activate
+pip install -r requirements.txt
+```
+
+3) Launch React app:
+```
+cd ..       # you should be at the root of the kevin-ui repo once again
+yarn start
+```
+
+4) Launch Flask back-end in a new terminal:
+```
+cd kevin-ui
+yarn start-api
+```
+
+5) Access the app from http://localhost:3000/ in your browser