Add newtoniansquare routine #15

Job	Run time
Julia 1 - ubuntu-latest - x64 - push	3m 6s
Julia lts - ubuntu-latest - x64 - push	2m 26s
Julia 1 - windows-latest - x64 - push	4m 2s
Julia lts - windows-latest - x64 - push	3m 19s
Julia lts - macOS-latest - x64 - push	3m 54s
Julia 1 - macOS-latest - x64 - push	4m 20s
	21m 7s

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