New guitar project (#264)

docs/projects/guitar.md

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+# Guitar
+![guitar icon](/static/mb/projects/guitar.png)
+### @description A beginner-intermediate maker activity, building a guitar with the micro:bit  
+
+### ~avatar avatar
+
+Make a micro:bit guitar with this guided tutorial! 
+
+### ~
+*playing micro:bit guitar*
+https://youtu.be/GYmdTFvxz80
+
+## Duration
+
+5 Activities, approx 30-45 min each based on familiarity with the coding concepts  
+
+## Materials
+* Cardboard large pieces (recycle!)
+* Tape (masking, duct Tape, and/or packing tape)
+* Markers and/or paint
+* Aluminum Foil
+* Scissors that can cut cardboard  
+* 1 micro:bit, battery holder and 2 AAA batteries
+* 4-5 Crocodile clips
+* Headphones
+
+## Activities
+* [Making the Guitar Body](/projects/guitar/making)  
+* [Buttons, Display & Sound](/projects/guitar/displaybuttons)  
+* [Light Sensor Tone control](/projects/guitar/lightsensor)  
+* [Accelerometer Beat control](/projects/guitar/accelerometer)  
+* [Pin Press Switch](/projects/guitar/pinpress)  
+
+### ~button /projects/guitar/making
+Let's get started!
+### ~