Adding readme with link to a repo containing a comprehensive multiagent postgreSQL data management example

[mehrsa]

Why are these changes needed?

Requesting to add a new example folder under Python samples so that AutoGen(0.4+) users can easily find this comprehensive example of using agents and Groupchats to build a multi-agent data management system for Azure postgreSQL. Readme contains link to a repo with comprehensive multiagent postgreSQL data management example

Related issue number

N/A

Checks

N/A (only a readme file)

• I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://github.com/microsoft/autogen/blob/main/CONTRIBUTING.md 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.

[mehrsa]

CC @ekzhu to review -- thanks!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.55%. Comparing base (c7757de) to head (33af957).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6443   +/-   ##
=======================================
  Coverage   78.55%   78.55%           
=======================================
  Files         225      225           
  Lines       16523    16523           
=======================================
  Hits        12979    12979           
  Misses       3544     3544           

Flag	Coverage Δ
unittests	78.55% <ø> (ø)

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