Simple-Kria-Kv260-Example Documentation

Reference firmware and software example for the Xilinx Kria KV260 Vision AI Starter Kit (Kria K26 SOM) (Xilinx Zynq UltraScale+ MPSoC, FPGA part xck26-sfvc784-2lv-c). Built on the SLAC axi-soc-ultra-plus-core platform; shared workflow documentation lives on the platform docs site.