Added README

README.md

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+## Guitar Fretboard
+
+This is a testing project to render an interactive guitar fretboard, with the ability to define markers to play specific notes.
+
+It was cobbled together from the following projects, so huge thanks to them:
+
+- https://github.com/KCarlile/guitar-diagrams-js - Drawing a customizable fretboard
+- https://tonejs.github.io/ - Playing audio
+- https://github.com/nbrosowsky/tonejs-instruments - Guitar sound samples