Beginnings of playground

[webbertakken]

Changes

• Run a real instance for actual end-to-end tests.

So far, known limitations: Does not have your real entities. For that, use https://github.com/Digital-Alchemy-TS/mock-home (which may be a better alternative altogether).

Checklist

• Read the contribution guide and accept the
  code of conduct
• Readme and docs (updated or not needed)
• Tests (added, updated or not needed)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 12.85%. Comparing base (ef6d687) to head (7beb122).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #15   +/-   ##
=======================================
  Coverage   12.85%   12.85%           
=======================================
  Files           3        3           
  Lines         140      140           
  Branches        3        2    -1     
=======================================
  Hits           18       18           
  Misses        120      120           
  Partials        2        2