[NotReeceHarris]

This pull request makes a small update to the README.md file by adding a Codecov coverage badge. This helps display the project's test coverage status directly in the documentation.

[github-actions]

🧪 Test coverage

File                           Stmts %  Branch %  Funcs %  Lines %
-----------------------------  -------  --------  -------  -------
oauth-proxy/worker.js              100       100      100      100
src/lib/archive/client.ts          100       100      100      100
src/lib/cache.ts                   100       100      100      100
src/lib/config/index.ts            100       100      100      100
src/lib/config/schema.ts           100       100      100      100
src/lib/github/api.ts              100       100      100      100
src/lib/github/auth.svelte.ts      100       100      100      100
src/lib/rep/engine.ts              100       100      100      100
src/lib/rep/ledger.ts              100       100      100      100
src/lib/ui.svelte.ts               100       100      100      100
src/lib/utils.ts                   100       100      100      100
TOTAL                              100       100      100      100

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (441ed2e) to head (dd3cc81).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #22   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           11        11           
  Lines          401       401           
  Branches        77        77           
=========================================
  Hits           401       401           

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