Add unidas logo

[d-chambers]

Description

This PR adds a simple logo to Unidas.

Checklist

I have (if applicable):

• referenced the GitHub issue this PR closes.
• documented the new feature with docstrings or appropriate doc page.
• included a test.
• added the "ready_for_review" tag once the PR is ready to be reviewed.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (6f88f7e) to head (8c6f7eb).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #10   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines          338       338           
=========================================
  Hits           338       338           

Flag	Coverage Δ
unittests	100.00% <ø> (ø)

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