chore: Add OSSF badge

[MaxymVlasov]

This badge include automatic checks which, when click on it, show repo security state, similar to Security tab in Github repo.

It less strict than #785, where part of checks should be filled manually

Relates #712

Summary by CodeRabbit

• Documentation
  • Added OpenSSF Scorecard badge to README to showcase project's security assessment

[coderabbitai]

Walkthrough

The pull request introduces an OpenSSF Scorecard badge to the project's README.md file. This badge provides a visual representation of the project's security and quality metrics, sourced from the OpenSSF Scorecard assessment. The addition is purely informative and does not modify any existing content, simply expanding the existing set of project badges.

Changes

File	Change Summary
README.md	Added OpenSSF Scorecard badge to project badges section

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📜 Recent review details

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📥 Commits

Reviewing files that changed from the base of the PR and between 980a129 and 0bebe9c.

📒 Files selected for processing (1)

• README.md (1 hunks)

✅ Files skipped from review due to trivial changes (1)

• README.md

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[antonbabenko]

This PR is included in version 1.97.1 🎉