Create index.md for Macro Pad project

Added initial documentation for the Macro Pad project.

Author: Jacob Waters

1209/7A3B/index.md

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+---
+layout: pid
+title: Macro Pad
+owner: Jacob_Waters
+license: MIT
+site: http://github.com/Jpwaters09/Macro-Pad
+source: http://github.com/Jpwaters09/Macro-Pad
+---
+A macro pad featuring 12 customisable mechanical keys, a customisable rotary encoder with button, and an OLED display. Based on the RP2354A microcontroller and micropython firmware.