Add a Blog Post on the AutoGen Assistant

[victordibia]

Why are these changes needed?

Add a Blog Post on the AutoGen Assistant

Related issue number

#737

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

Attention: 86 lines in your changes are missing coverage. Please review.

Comparison is base (370ebf5) 29.81% compared to head (f51a038) 27.66%.
Report is 38 commits behind head on main.

Files	Patch %	Lines
autogen/oai/client.py	10.00%	27 Missing ⚠️
autogen/agentchat/conversable_agent.py	5.88%	16 Missing ⚠️
...gen/agentchat/contrib/retrieve_user_proxy_agent.py	0.00%	12 Missing ⚠️
autogen/agentchat/contrib/gpt_assistant_agent.py	0.00%	11 Missing ⚠️
autogen/oai/openai_utils.py	25.00%	6 Missing ⚠️
autogen/retrieve_utils.py	0.00%	6 Missing ⚠️
...ntchat/contrib/qdrant_retrieve_user_proxy_agent.py	0.00%	2 Missing ⚠️
autogen/agentchat/contrib/teachable_agent.py	0.00%	2 Missing ⚠️
autogen/agentchat/groupchat.py	60.00%	2 Missing ⚠️
autogen/oai/completion.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #834      +/-   ##
==========================================
- Coverage   29.81%   27.66%   -2.15%     
==========================================
  Files          27       27              
  Lines        3448     3517      +69     
  Branches      780      801      +21     
==========================================
- Hits         1028      973      -55     
- Misses       2346     2473     +127     
+ Partials       74       71       -3     

Flag	Coverage Δ
unittests	27.60% <12.24%> (-2.15%)	⬇️

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[sonichi]

Minor suggestions.