Update README.md

README.md

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 # restitution-cobweb
+
+## Description
+
 Dashboard to investigate dynamics of a periodically stimulated cardiac cell based on its restitution function.
 Displays the restitution function, the iterative map as a cobweb plot, and the APD sequence.
 Parameters for the simulation and the restitution function may be varied using the sliders.
 
-Launch app here:
-https://restitution-cobweb.herokuapp.com/
+The app is currently hosted on Heroku [here](https://restitution-cobweb.herokuapp.com/).
+
+## Running the app locally
+
+To run the app on your local computer, clone the repository, create a virtual environment and install the necessary requirements with
+```
+pip install --upgrade pip
+pip install -r requirements.txt
+```
+
+Then run the app with
+```
+python app.py
+```
+
+This should show
+```
+Dash is running on http://127.0.0.1:8050/
+```
+
+You can now visit the app at this URL. 
+
+## Preview
+
+<img width="930" alt="Screenshot 2022-08-29 at 3 41 27 PM" src="https://user-images.githubusercontent.com/36854425/187284481-80b865ef-7d67-44df-bf37-706dd4621c1d.png">
+
+