feat: enhance README and CI configuration

- Added badges for CI/CD pipeline, code coverage, Python version, and license to `README.md`.
- Updated CI configuration in `.github/workflows/ci.yml` to include a matrix for Python versions and improved setup steps for Python environment.
- Introduced a coverage threshold check in the testing job and added pip-audit for dependency vulnerability scanning in the security job.

Author: thibaultcordier

.github/workflows/ci.yml

@@ -12,7 +12,6 @@ env:
   UV_VERSION: "0.8.13"
   MIN_COVERAGE: 0
   PYTHON_VERSION: "3.13"  # Default Python version for non-matrix jobs
-  PYTHON_VERSIONS: '["3.9", "3.10", "3.11", "3.12", "3.13"]'  # Python versions for matrix testing
 
 jobs:
   lint:
@@ -66,7 +65,7 @@ jobs:
     timeout-minutes: 30
     strategy:
       matrix:
-        python-version: ${{ fromJson(env.PYTHON_VERSIONS) }}
+        python-version: [3.9, 3.10, 3.11, 3.12, 3.13]
         os: [ubuntu-latest, macos-latest]
 
     steps: