Update readme for other devs. (#20)

* Added Getting Started section.

Author: bfeif

README.md

@@ -1,5 +1,21 @@
 # clarence
 Herein lies the code that powers [checkmymate.co](http://checkmymate.co/), a website that enables you to see how to beat your friends at chess.
 
-## About
-This app is brought to you in part by flask.
+## Getting Started
+So you want to work on checkmymate? Great! To develop and test locally, all you need to do is clone the project, create a virtual environment, and launch the flask app:
+
+### Clone the project
+Run the following command in your terminal:
+`git clone https://github.com/bfeif/clarence.git`
+
+### Create a virtual environment
+This project encourages the built-in python `venv` tool for managing virtual environments. To create a virtual environment for this project, run the following commands in terminal:
+1. `cd path/to/clarence` - Go to the root of the project directory.
+2. `python3 -m venv .venv` - Create a virtual environment.
+3. `source .venv/bin/activate` - Activate the virtual environment.
+4. `pip install -r requirements.txt` - Install all necessary packages to the virtual environment.
+
+### Launch the flask app
+1. With the virtual environment activated, launch the flask app with `flask run`.
+2. A bunch of text will pop up in your terminal, one of which will say something like `Running on http://127.0.0.1:5000/`. Copy and paste this url to your web-browser. 
+3. Great! Now you have the application running locally, and you should be able to see the changes you make in the code automatically update in your browser!