Improved README with instructions, updated screenshot

Author: thecodeah

README.md

@@ -1,4 +1,16 @@
 # Space Typer
 Space Typer is a typing game written in Python using the [Arcade](http://arcade.academy/) library.
 
+## How to play
+You can play the game by downloading the stand-alone binary version, which can be found in the releases.
+
+Alternatively, you can install all of the dependencies, then run the python script yourself:
+```
+pip install --user -r requirements.txt && python space-typer.py
+```
+Using pipenv :
+```
+pipenv run python space-typer.py
+```
+
 ![screenshot](screenshot.png "Screenshot")