add diagnostic.jl #23

Job	Run time
Documentation	1m 22s
Julia 1.0 - ubuntu-latest - x64	3m 14s
Julia 1.0 - macOS-latest - x64	5m 10s
Julia 1.0 - windows-latest - x64	7m 9s
Julia 1 - ubuntu-latest - x64	1m 42s
Julia 1 - macOS-latest - x64	2m 12s
Julia 1 - windows-latest - x64	2m 27s
Julia ^1.8.0-0 - ubuntu-latest - x64	1m 43s
Julia ^1.8.0-0 - macOS-latest - x64	2m 1s
Julia ^1.8.0-0 - windows-latest - x64	2m 29s
Julia nightly - ubuntu-latest - x64	2m 39s
Julia nightly - macOS-latest - x64	3m 24s
Julia nightly - windows-latest - x64	3m 28s
	39m 0s

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