add K1 and update tutorial

[codecov[bot]]

Codecov Report

Merging #96 (7de1ba3) into main (652acd2) will increase coverage by 1.38%. The diff coverage is 97.33%.

@@            Coverage Diff             @@
##             main      #96      +/-   ##
==========================================
+ Coverage   79.45%   80.84%   +1.38%     
==========================================
  Files          26       27       +1     
  Lines        1772     1853      +81     
==========================================
+ Hits         1408     1498      +90     
+ Misses        364      355       -9     

Impacted Files	Coverage Δ
src/iterations/iterations.jl	98.03% <ø> (+0.03%)	:arrow_up:
src/iterations/solvers/Newton/K3Krylov.jl	93.90% <ø> (+5.01%)	:arrow_up:
src/iterations/solvers/normal/K1Krylov.jl	96.66% <96.66%> (ø)
src/iterations/solve_method.jl	98.71% <100.00%> (ø)
src/iterations/solvers/Krylov_utils.jl	100.00% <100.00%> (ø)
src/types_definition.jl	94.11% <100.00%> (+0.24%)	:arrow_up:
src/utils.jl	84.09% <100.00%> (+1.16%)	:arrow_up:
src/iterations/preconditioners/identity.jl	100.00% <0.00%> (ø)
... and 8 more

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