Add readme

README.md

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+markov-music
+============
+
+Markov chains are a map of probabilities of one discrete state transitioning to
+another. This is a simple implementation of them to create chord progressions.
+They are pretty straight forward and could be great for practicing quickly
+playing chords on piano/guitar
+
+Use 
+---
+
+To compile and run
+```
+make all
+./bin/markov-music
+```