Add pc-gaming skill for hardware specs and graphics settings advice

skills/pc-gaming/references/hardware.md

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+# PC Hardware Specs
+
+## GPU
+- **Model:** AMD Radeon RX 7900 XTX
+- **VRAM:** 24 GB GDDR6
+- **Architecture:** RDNA 3
+- **RT Performance:** Good for light RT, struggles with heavy RT (path tracing) at 4K
+- **Upscaling:** FSR 3.x (frame gen + spatial)
+
+## Display
+- **Resolution:** 4K (3840x2160)
+- **Refresh Rate:** TODO
+- **FreeSync:** TODO
+- **HDR:** TODO
+
+## CPU
+- **Model:** TODO
+- **Cores/Threads:** TODO
+
+## RAM
+- **Size:** TODO
+- **Speed:** TODO
+
+## Storage
+- **Type:** TODO (SSD?)
+
+## OS / Driver
+- **OS:** TODO (Linux distro?)
+- **Mesa Version:** Mesa 26.0 (as of Feb 2026)
+- **Proton:** TODO
+
+## Gaming Device
+- **Handheld:** GPD Win 4 (separate device, for portable gaming)
+- **Desktop:** Main gaming PC (specs above)
+
+---
+*Last updated: 2026-02-26*