Added page "How do I ..."

[forman]

Added initial documentation page "How do I ...".

Closes #66

Checklist (strike out non-applicable):

• [x] Changes documented in CHANGES.md
• [x] Related issue exists and is referred to in the PR description and CHANGES.md
• [ ] ~Added docstrings and API docs for any new/modified user-facing classes and functions~
• [x] Changes/features documented in docs/*
• [ ] ~Unit-tests adapted/added for changes/features~
• [ ] ~Test coverage remains or increases (target 100%)~

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.93%. Comparing base (ab74336) to head (f589cf0). Report is 7 commits behind head on main.

:exclamation: Current head f589cf0 differs from pull request most recent head 88706e5

Please upload reports for the commit 88706e5 to get more accurate results.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #90 +/- ## ======================================= Coverage 99.93% 99.93% ======================================= Files 30 30 Lines 1454 1454 ======================================= Hits 1453 1453 Misses 1 1 ```

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