Update README.md

Author: bcorfman

README.md

@@ -4,7 +4,7 @@
 
 ## Project description
 
-Raven is a checkers game program, for one or two players. While there are examples of excellent & free checkers programs out on the net (such as [Martin Fierz's Checkerboard](http://www.fierz.ch/checkers.htm)), Raven features are designed primarily for learning checkers.
+Raven is a checkers game program, for one or two players. While there are examples of excellent & free checkers programs out on the net (such as [Martin Fierz's Checkerboard](http://www.fierz.ch/checkers.htm)), Raven features are designed primarily for learning checkers, basic AI algorithms, and application design in Python.
 
 * **Open-source code**. Raven uses existing open source code as a basis ([Martin Fierz's Simple Checkers evaluation function](http://www.fierz.ch/engines.php) and [Peter Norvig's search code from the AIMA project](http://aima.cs.berkeley.edu/python/readme.html)) for its AI engine. My own Python code is also open source.
 * **Cross-platform**. Raven has been tested on Python 3.9-3.11 with Windows, OS X, and Linux, and that means the code itself is not locked into a particular operating system. The GUI is written with Python's built-in cross-platform GUI, Tkinter.