RaZ

[Readme] Added an XR section #1794

Job	Run time
Emscripten (emcc, Debug)	3m 38s
macOS (clang, Debug)	2m 45s
Windows (cl, Debug)	5m 40s
Linux (gcc, Debug)	9m 44s
macOS (clang, Release)	4m 27s
Windows (cl, Release)	9m 54s
macOS (clang, Debug, no audio)	2m 15s
Linux (gcc, Release)	5m 41s
Windows (cl, Debug, no audio)	6m 0s
Emscripten (emcc, Release)	9m 8s
Windows (cl, Debug, no window)	5m 16s
Linux (clang, Debug)	5m 20s
macOS (clang, Debug, no window)	1m 28s
Emscripten (emcc, Debug, no audio)	3m 33s
Linux (clang, Release)	6m 19s
Linux (gcc, Debug, no audio)	5m 48s
Linux (gcc, Debug, no window)	4m 10s
	1h 31m 6s

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