dell-precision-5560: add README

dell/precision/5560/README.md

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+## Dell Precision 5560
+
+- Intel i7-11800H
+- 00:02.0 VGA compatible controller [0300]: Intel Corporation TigerLake-H GT1 [UHD Graphics] [8086:9a60] (rev 01)
+- 01:00.0 3D controller [0302]: NVIDIA Corporation TU117GLM [T1200 Laptop GPU] [10de:1fbc] (rev a1)
+
+If you want to use the new Intel Xe driver, add this to your config:
+```nix
+boot.extraModprobeConfig = ''
+  options xe force_probe=9a60
+  options i915 force_probe=!9a60
+'';
+```
+
+And you should decide what you want to do with the NVIDIA GPU, either sync or offload.
+
+Fwupd works, you can update the BIOS and DBX.
+```nix
+services.fwupd.enable = true;
+```