Added ability to use esc key to exit, and readme for details

UrsaCraft_video.py

@@ -26,6 +26,7 @@ def update():
 	if held_keys['2']: block_pick = 2
 	if held_keys['3']: block_pick = 3
 	if held_keys['4']: block_pick = 4
+	if held_keys['escape']: sys.exit()
 
 class Voxel(Button):
 	def __init__(self, position = (0,0,0), texture = grass_texture):

readme.md

@@ -0,0 +1,46 @@
+# Minecraft in python
+
+For a walkthrough of the development, and code explanation check out the video [here](https://www.youtube.com/watch?v=DHSRaVeQxIk&feature=youtu.be). This is meant to be a ursina demo, not a full game.
+
+
+
+**Currently ursina does not support MacOS, and so this can't be run on MacOS computers**
+
+
+
+## Setup
+
+You will need to have python installed, along with pip for python. 
+
+
+
+To get setup run:
+
+1. `pip install ursina` or `sudo pip3 install ursina`
+2. Run `python UrsaCraft_video.py` or `python3 UrsaCraft_video.py` to start the game
+
+
+
+## Controls
+
+W - Move forward
+
+A - Move left
+
+D - Move right
+
+S - Move backward
+
+Left mouse click - Add block of currently selected block type
+
+Right mouse click - Remove currently highlighted block (highlight by hovering over with your mouse)
+
+1 - Set block type to grass
+
+2 - Set block type to stone
+
+3 - Set block type to brick
+
+4 - Set block type to dirt
+
+esc - Exit game