Add OSSF Scorecard GH Action and badge to README

[CyrilBaah]

• Improvement Area:
  Add OpenSSF Scorecard GitHub Action to automatically evaluate the security and best practices of the repository.

• Reasons:
  Integrating the OSSF Scorecard will help identify vulnerabilities, improve the code's security posture, and increase transparency for contributors and users.

• Benefits
  to help open source maintainers improve their security best practices and to help open source consumers judge whether their dependencies are safe.

[berkingurcan]

What do you think @johnmarcou ?