Create index.md for ZeyBack R2RDAC project

Added project details for ZeyBack R2RDAC.

Author: ERDALECE

1209/2028/index.md

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+---
+layout: pid
+title: ZeyBack R2RDAC
+owner: ZeyBack
+license: GPL-3.0-or-later
+site: https://github.com/ERDALECE/ZeyBack
+source: https://github.com/ERDALECE/ZeyBack
+---
+
+USB Audio Class 2.0 interface (STM32H743 + FPGA) for a discrete R-2R DAC platform.
+Native DSD experiments in progress.