Add simple example with Atomix.jl #472

Job	Run time
Documentation	1m 55s
Doctests	1m 49s
CI (1.6, ubuntu-latest, x64)	2m 49s
CI (1.6, macOS-latest, x64)	5m 3s
CI (1.6, windows-latest, x64)	11m 24s
CI (1.7, ubuntu-latest, x64)	3m 23s
CI (1.7, macOS-latest, x64)	6m 55s
CI (1.7, windows-latest, x64)	3m 53s
CI (1.8, ubuntu-latest, x64)	3m 15s
CI (1.8, macOS-latest, x64)	5m 5s
CI (1.8, windows-latest, x64)	4m 2s
CI (1.9, ubuntu-latest, x64)	3m 4s
CI (1.9, macOS-latest, x64)	7m 57s
CI (1.9, windows-latest, x64)	3m 31s
CI (nightly, ubuntu-latest, x64, true)	2m 57s
	1h 7m 2s

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