Add AngleGators description

hfoss-2195/describe-AngleGators.md

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+# AngleGators (PY)
+
+### Assignees
+zethra(1)
+
+# Game mechanics
+
+## Title screen
+When the game is started, the player is presented with this title screen.  There
+is also a 'How to play' button that displays the rules, a credits button that
+displays the names of the authors, and a quit button that exits the game.
+
+![image](https://user-images.githubusercontent.com/6034238/79921791-03189d80-8401-11ea-9351-23fa226680ee.png)
+
+We'll start with the game itself.  The payer clicks 'Start' to start
+
+## The Game
+
+The game screen consists of the alligator on the right and various food items
+coming in from the right.  Each food item has a number above it, denoting an
+angle.  These are in increments of of 10 from 10 to 90 degrees. The player then
+presses the left and right arrow keys to open and close the alligators mouth.
+The player must open the mouth to angle matching the number on the food.  The
+angle the mouth is open is also displayed as a number.  The current score and
+number of teeth are displayed at the top right.
+
+![image](https://user-images.githubusercontent.com/6034238/79922005-32c7a580-8401-11ea-9d2b-af628bf8898b.png)
+
+## Scoring
+
+The alligator starts with three "teeth" if a food reaches the alligator and its
+mouth isn't open wide enough, the alligator losses a tooth.  If the alligator
+runs out of teeth the game ends and returns to the title screen.  If the
+alligator's mouth is open wide enough then the player receives points.  They
+receive 20 points if the mouth is open the exact right amount, 10 point if they
+are off by 10 degrees and 5 points if they are off by 20 degrees.
+
+# Other screens
+
+How to play
+
+![image](https://user-images.githubusercontent.com/6034238/79925995-cac98d00-8409-11ea-8292-1e3bbacc1792.png)
+
+Credits
+
+![image](https://user-images.githubusercontent.com/6034238/79926003-d321c800-8409-11ea-9ccd-5a95ca7ebbf2.png)