Add a game launcher example. #17

Job	Run time
build-native (double, macos, editor)	16m 33s
build-native (double, macos, template_debug)	12m 58s
build-native (double, macos, template_release)	9m 18s
build (double, android, editor)	38m 8s
build (double, android, template_debug)	31m 30s
build (double, android, template_release)	31m 22s
build (double, linuxbsd, editor)	40m 0s
build (double, linuxbsd, template_debug)	36m 24s
build (double, linuxbsd, template_release)	36m 56s
build (double, web, editor)	54m 5s
build (double, web, template_debug)	40m 35s
build (double, web, template_release)	39m 57s
build (double, windows, editor)	49m 34s
build (double, windows, template_debug)	39m 46s
build (double, windows, template_release)	54m 3s
merge	2m 37s
release	3m 59s
	8h 57m 45s

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