chore(readme): add badge

[AugustinMauroy]

Description

• Add codecov badge to display the code coverage on the readme
• Add "CII-Best-Practices" badge which is required by OpenSSF scorecard

Related Issues

No related issues, I just noticed this

Check List

• I have read the Contributing Guidelines and made commit messages that follow the guideline.
• NA I have run node --run test and all tests passed.
• NA I have check code formatting with node --run format & node --run lint.
• NA I've covered new added functionality with unit tests if necessary.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.31%. Comparing base (32834c4) to head (eac8410).

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #284   +/-   ##
=======================================
  Coverage   91.31%   91.31%           
=======================================
  Files          51       51           
  Lines        3674     3674           
  Branches      166      166           
=======================================
  Hits         3355     3355           
  Misses        318      318           
  Partials        1        1           

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[Copilot]

Pull Request Overview

Adds visibility metrics to the project’s README by including badges for code coverage and best practices scoring.

• Insert Codecov badge with coverage graph
• Insert CII Best Practices badge

[ovflowd]

Fast-tracking due to the nature of this change.