Add the basic About button with version information #285

Job	Run time
Build MDANSE and run tests on ubuntu-20.04	3m 6s
Build MDANSE and run tests on ubuntu-20.04	3m 13s
Build MDANSE and run tests on ubuntu-20.04	2m 53s
Build MDANSE and run tests on ubuntu-20.04	3m 6s
Build MDANSE and run tests on windows-2019	4m 10s
Build MDANSE and run tests on windows-2019	5m 5s
Build MDANSE and run tests on windows-2019	3m 17s
Build MDANSE and run tests on windows-2019	6m 19s
Build MDANSE and run tests on macOS-11	5m 14s
Build MDANSE and run tests on macOS-11	5m 21s
Build MDANSE and run tests on macOS-11	5m 39s
Build MDANSE and run tests on macOS-11	6m 32s
	53m 55s

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