Add description and client code to websocket example (#1418)

[987Nabil]

This fixes #1418. I added to the existing example a client counterpart and wrote for client and server an actual documentation instead of just an example code snippet.

/claim #1418

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c846a86) 64.47% compared to head (1200338) 64.50%.
Report is 2 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2567      +/-   ##
==========================================
+ Coverage   64.47%   64.50%   +0.02%     
==========================================
  Files         140      140              
  Lines        8302     8302              
  Branches     1496     1496              
==========================================
+ Hits         5353     5355       +2     
+ Misses       2949     2947       -2     

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