Add Websockets example

[davorrunje]

Why are these changes needed?

Related issue number

Checks

• I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://microsoft.github.io/autogen/docs/Contribute#documentation to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 38.14%. Comparing base (4a44093) to head (330433f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2291   +/-   ##
=======================================
  Coverage   38.14%   38.14%           
=======================================
  Files          78       78           
  Lines        7865     7865           
  Branches     1683     1683           
=======================================
  Hits         3000     3000           
  Misses       4615     4615           
  Partials      250      250           

Flag	Coverage Δ
unittests	38.13% <ø> (ø)

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