Add job reference documentation

[JenswBE]

As I noticed quite some issues due to missing documentation on the original repo, I created a Jobs reference document. The document was created based on reverse engineering and trail-and-error. So, hopefully everything is correct. :)

Related issues: #22 , #44 , #56 , #69

I also sent a PR to Trane9991's repo including docs for his docker tags:
taraspos#1

[codecov]

Codecov Report

Merging #72 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #72   +/-   ##
=======================================
  Coverage   69.89%   69.89%           
=======================================
  Files          15       15           
  Lines         734      734           
=======================================
  Hits          513      513           
  Misses        167      167           
  Partials       54       54

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[taraspos]

Thanks!
I merged this along with my fork, so going to close this PR.