put lessons back for Michael

docs/lessons/classic-beatbox.md

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+# classic beatbox 
+
+display beautiful images on the BBC micro:bit.
+
+## Topic
+
+Music
+
+## Quick Links
+
+* [activity](/lessons/classic-beatbox/activity)
+* [challenges](/lessons/classic-beatbox/challenges)
+
+
+
+## Prior learning/place of lesson in scheme of work
+
+Learn how to make a beatbox music player using pins P1 and P2. We will be learning how to code musical notes using a local variable, for loop, on pin pressed as well as simple commands such as play and notes.
+
+## Objectives
+
+* learn how to code music on the BBC micro:bit
+