Add spell checking configuration #959

Job	Run time
DiffEqBase.jl/Core/1	3m 58s
SciMLBase.jl/Core/1	7m 5s
DiffEqBase.jl/Downstream/1	23m 35s
OrdinaryDiffEq.jl/Interface/1	1h 15m 24s
OrdinaryDiffEq.jl/Core/1	15m 57s
DiffEqSensitivity.jl/Core/1	19m 11s
LabelledArrays.jl/RecursiveArrayTools/1	6m 56s
DiffEqBase.jl/Downstream2/1	25m 18s
DelayDiffEq.jl/Interface/1	16m 50s
SciMLSensitivity.jl/Core1/1	54m 13s
SciMLSensitivity.jl/Core6/1	41m 27s
SciMLSensitivity.jl/Core2/1	41m 13s
SciMLSensitivity.jl/Core5/1	6h 0m 7s
SciMLSensitivity.jl/Core4/1	36m 34s
SciMLSensitivity.jl/Core3/1	45m 5s
	12h 52m 53s

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