Added Playbackpad

Author: dave9123

hackpads/playbackpad/.gitignore

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+*-backups
+fp-info-cache
+firmware/kmk
+firmware/boot.py
+pcb/gerber_to_order

hackpads/playbackpad/README.md

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+# Playbackpad
+
+A pad with a rotary encoder and 3 switches to control playback and volume. I made this because it's painful to go to the app and click on pause every time it's my time to talk in a meeting <i>yes I listen to music while meeting 😁</i>.
+
+## PCB
+
+I quite enjoyed the PCB making process even though it was painful to find libraries for the OLED so I didn't use it.
+
+Schematics | PCB
+:--------: | :-:
+![Schematics](images/kicad_f89OjKkaKC.png) | ![PCB](images/kicad_zTUGdFkLCO.png)
+
+## CAD
+
+Made the casing with Fusion 360, quite painful to make the holes ngl 💀🙏
+
+![Casing](images/CADAssistant_iCwul75G0X.png)
+
+## Firmware
+
+Made it with KMK firmware, the rotary encoder for volume, the switch on the rotary encoder for mute/unmute, the left key for previous, the middle key for play/pause, the right key for next.
+
+## BOM
+
+- 3 Cherry MX switches
+- 3 Black Blank DSA keycaps
+- 4 M3x0.5x16 mm screws
+- 1 Seeed XIAO RP2040
+- 3D printed case