Initial write up with sections from original documentation

[martintc]

I'm submitting a

• bug fix
• feature
• documentation addition

What is the current behaviour?

If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem

What is the expected behavior?

#261

What is the motivation / use case for changing the behavior?

Please tell us about your environment:

Version (comtrya --version):
Operating system:

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (00b5190) 28.59% compared to head (d21fe4f) 28.59%.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #354   +/-   ##
=======================================
  Coverage   28.59%   28.59%           
=======================================
  Files          84       84           
  Lines        2263     2263           
=======================================
  Hits          647      647           
  Misses       1616     1616           

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