Update SDG Readme

[MooooCat]

Description

We made a simple change to the logo.

Motivation and Context

We are proud to add a single table model using LLM for synthetic data generation, which will help reduce preprocessing work and improve the quality of synthetic data.

We add this groundbreaking change on our logo.

Types of changes

• Maintenance (no change in code, maintain the project's CI, docs, etc.)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (269063d) 79.87% compared to head (b8a8982) 79.87%.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #139   +/-   ##
=======================================
  Coverage   79.87%   79.87%           
=======================================
  Files          69       69           
  Lines        3250     3250           
=======================================
  Hits         2596     2596           
  Misses        654      654           

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