Add 3D demo #72

Job	Run time
Windows Editor Compilation	8m 36s
Windows Debug Compilation	7m 31s
Windows Release Compilation	7m 22s
Ubuntu Editor Compilation	7m 35s
Ubuntu Debug Compilation	7m 1s
Ubuntu Release Compilation	6m 53s
MacOS Editor Compilation	22m 15s
MacOS Debug Compilation	25m 6s
MacOS Release Compilation	23m 39s
Android Editor Compilation	5m 16s
Android Debug Compilation	5m 35s
Android Release Compilation	5m 11s
iOS Debug Compilation	13m 27s
iOS Release Compilation	16m 11s
create-android-plugin (ubuntu-20.04)	1m 59s
	2h 43m 37s

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