Add example subproject #264

Job	Run time
Documentation	2m 42s
Format	57s
Performance	2m 13s
Julia 1.5 - ubuntu-latest - x64	5m 53s
Julia 1.5 - ubuntu-latest - x86	4m 0s
Julia 1.5 - macOS-latest - x64	7m 40s
Julia 1.5 - windows-latest - x64	8m 48s
Julia 1.5 - windows-latest - x86	16m 21s
Julia nightly - ubuntu-latest - x64	2m 32s
Julia nightly - ubuntu-latest - x86	2m 59s
Julia nightly - macOS-latest - x64	3m 47s
Julia nightly - windows-latest - x64	5m 45s
Julia nightly - windows-latest - x86	3m 55s
	1h 7m 32s

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