Added tested supported card

Author: hydrian

README.md

@@ -8,7 +8,7 @@ Provides a Dockerfile that packages the [AUTOMATIC1111 fork Stable Diffusion Web
 
 Requirements
 --
-- A compatible Radeon card (VEGA 56/64, Radeon RX 67XX/68XX/69XX). Other cards may also function at some capacity.
+- A compatible Radeon card (VEGA 56/64, Radeon RX 6600XT/67XX/68XX/69XX). Other cards may also function at some capacity.
 - Modern Linux kernel with ROCM module (Kernel 5.10+)
 - Docker
 - Approximately 50GB of drive space for docker installation