Initial code for 4 point model

[ufechner7]

Work in progress...

[codecov-commenter]

Codecov Report

Merging #15 (c5c13aa) into main (58e3161) will increase coverage by 1.76%.
The diff coverage is 97.73%.

@@            Coverage Diff             @@
##             main      #15      +/-   ##
==========================================
+ Coverage   95.45%   97.22%   +1.76%     
==========================================
  Files           1        3       +2     
  Lines         242      504     +262     
==========================================
+ Hits          231      490     +259     
- Misses         11       14       +3     

Impacted Files	Coverage Δ
src/KPS3.jl	95.90% <95.90%> (ø)
src/KPS4.jl	98.83% <98.83%> (ø)
src/KiteModels.jl	94.66% <100.00%> (-0.79%)	⬇️

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