Add documentation on how to work with GitHub

[uhafner]

No description provided.

[codecov-io]

Codecov Report

Merging #144 into master will not change coverage by %.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #144   +/-   ##
=========================================
  Coverage     86.52%   86.52%           
  Complexity       75       75           
=========================================
  Files             8        8           
  Lines           319      319           
  Branches         47       47           
=========================================
  Hits            276      276           
  Misses           35       35           
  Partials          8        8           

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[Lenz-K]

Sehr gute Beschreibung. Mir ist nichts zu verbessern aufgefallen.

[uhafner]

Gut, umso besser. Danke!