Add using ADNLPProblems in benchmark tutorial (#323) #614

Job	Run time
Julia 1.6 - ubuntu-latest - x64 - push	26m 46s
Julia 1.6 - macOS-latest - x64 - push	34m 52s
Julia 1.6 - windows-latest - x64 - push	35m 25s
Julia 1 - ubuntu-latest - x64 - push	16m 3s
Julia 1 - macOS-latest - x64 - push	22m 49s
Julia 1 - windows-latest - x64 - push	17m 14s
Julia nightly - ubuntu-latest - x64 - push	22m 21s
Julia nightly - macOS-latest - x64 - push	27m 46s
Julia nightly - windows-latest - x64 - push	22m 42s
	3h 45m 58s

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