Create index.md for USB-I2C Bridge Board

Author: ichirowo

1209/3030/index.md

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+---
+layout: pid
+title: USB-I2C Bridge Board
+owner: ichirowo
+license: MIT License
+site: https://github.com/ichirowo/USB-I2C-Bridge-Board
+source: https://github.com/ichirowo/USB-I2C-Bridge-Board
+---
+The hardware is designed in a compact 66 mm × 24 mm form factor and features an RP2040 microcontroller along with 16 Mbit of flash memory. It includes a Grove connector and is built as a USB dongle, functioning as a USB-to-I2C bridge board.
+