docs: add installation and quick start to readme

[mrlubos]

Closes #1491

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Latest commit: a267462

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Name	Status	Preview	Comments	Updated (UTC)
hey-api-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 8, 2025 9:39am

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.25%. Comparing base (13eea59) to head (a267462).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1537   +/-   ##
=======================================
  Coverage   59.25%   59.25%           
=======================================
  Files         158      158           
  Lines       24737    24737           
  Branches     1887     1887           
=======================================
  Hits        14657    14657           
  Misses      10073    10073           
  Partials        7        7           

Flag	Coverage Δ
unittests	59.25% <ø> (ø)

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commit: a267462