Add Developer documentation

[rikroe]

Proposed change

Enhances documentation for developers:

• Use fingerprints from tests in Home Assistant for component development
• More information on how to capture traffic between app & API

Type of change

• Bugfix (non-breaking change which fixes an issue)
• New feature (which adds functionality to this library)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue: reproviding the remote service history #383, Replacement for the old '/vehicles/{VIN}/executeService' endpoint? #387, Remote Service for "chargingProfile" #391

Checklist

• The code change is tested and works locally.
• Tests have been added to verify that the new code works.

[codecov-commenter]

Codecov Report

Merging #392 (b425c3c) into master (f0aeaa3) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #392   +/-   ##
=======================================
  Coverage   96.91%   96.91%           
=======================================
  Files           8        8           
  Lines         939      939           
=======================================
  Hits          910      910           
  Misses         29       29           

Flag	Coverage Δ
3.10.x	96.80% <ø> (ø)
3.6	96.89% <ø> (ø)
3.7	96.79% <ø> (ø)
3.8	96.80% <ø> (ø)
3.9	96.80% <ø> (ø)

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[github-actions]

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