Add actual notes that our music box plays

MusicBoxNotes.txt

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+G3		Low
+C4
+D4
+E4
+F4
+G4
+A4
+A#4
+B4
+C5
+C#5
+D5
+D#5
+E5
+F5
+F#5
+G5
+G#5
+A5
+A#5
+B5
+C6
+C#6
+D6
+D#6
+E6
+F6
+F#6
+G6
+A6		High

README.md

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+# MusicBoxConverter
+
+> Converts MIDI files into music box scores that are ready to print.
+
+## Useful Links
+ - [ffmpeg - showspectrumpic manual](https://ffmpeg.org/ffmpeg-filters.html#showspectrumpic)
+ - [Frequency to Musical Note Converter](https://newt.phys.unsw.edu.au/music/note/)