Add of background, description and contribute to documentation

[christoffergranberg]

Update of documentation regarding background and contribution requests

[codecov-commenter]

Codecov Report

Merging #36 (e426086) into master (85d145f) will increase coverage by 4.46%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #36      +/-   ##
==========================================
+ Coverage   53.20%   57.66%   +4.46%     
==========================================
  Files          39       40       +1     
  Lines        1453     2251     +798     
==========================================
+ Hits          773     1298     +525     
- Misses        680      953     +273     

Impacted Files	Coverage Δ
.../pyskindose/plotting/create_geometry_plot_texts.py	26.92% <0.00%> (-14.26%)	⬇️
src/pyskindose/plotting/plot_geometry.py	57.14% <0.00%> (-9.53%)	⬇️
src/pyskindose/analyze_data.py	46.15% <0.00%> (-6.79%)	⬇️
src/pyskindose/plotting/create_geometry_plot.py	28.57% <0.00%> (-6.73%)	⬇️
...yskindose/plotting/create_plot_and_save_to_file.py	50.00% <0.00%> (-5.56%)	⬇️
src/pyskindose/plotting/create_mesh3d.py	15.38% <0.00%> (-5.31%)	⬇️
src/pyskindose/plotting/plot_event.py	43.33% <0.00%> (-4.04%)	⬇️
...ng/create_irradiation_event_procedure_plot_data.py	42.55% <0.00%> (-3.88%)	⬇️
src/pyskindose/corrections.py	71.60% <0.00%> (-3.40%)	⬇️
...pyskindose/plotting/create_setup_and_event_plot.py	41.50% <0.00%> (-3.32%)	⬇️
... and 26 more

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