Create: funding.json for Retro Funding Round 5

[taempark]

Add: funding.json for Retro Funding Round 5

Description
Sunnyside Labs is applying to Retro Funding 5. From Retro Funding Round 5, the application is required to add the JSON file to prove that the applicant is a contributor to the repository.

Tests
N/A

Additional context
N/A

Metadata
N/A

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.30%. Comparing base (48f5313) to head (5a8315d).

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #78   +/-   ##
=======================================
  Coverage   72.30%   72.30%           
=======================================
  Files          16       16           
  Lines        2723     2723           
=======================================
  Hits         1969     1969           
  Misses        670      670           
  Partials       84       84           

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[taempark]

Closing until the Proof team's confirmation.