add a project toml

[codecov[bot]]

Codecov Report

Merging #107 into master will decrease coverage by 2.03%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #107      +/-   ##
==========================================
- Coverage   93.45%   91.42%   -2.04%     
==========================================
  Files          10       10              
  Lines         489      408      -81     
==========================================
- Hits          457      373      -84     
- Misses         32       35       +3

Impacted Files	Coverage Δ
src/interface.jl	83.87% <0%> (-8.76%)	:arrow_down:
src/objective_types/constraints.jl	93.4% <0%> (-2.25%)	:arrow_down:
src/NLSolversBase.jl	80% <0%> (-1.82%)	:arrow_down:
src/objective_types/twicedifferentiable.jl	98.14% <0%> (-0.16%)	:arrow_down:
src/objective_types/incomplete.jl	97.61% <0%> (-0.06%)	:arrow_down:
src/objective_types/twicedifferentiablehv.jl	100% <0%> (ø)	:arrow_up:
src/objective_types/oncedifferentiable.jl	89.06% <0%> (+2.47%)	:arrow_up:

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[pkofod]

Thanks

[ChrisRackauckas]

I think this one needs to go before NLsolve.