feat: added the scorecard github action and its badge

[harshitasao]

Description

PR to add the Scorecard GitHub Action and its badge in the README file.

Related Issue

#3362

Motivation and Context

Enhances the security posture, increasing user trust and reducing the risk of security exploits.

Screenshots (if appropriate)

N/A

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation Update (if none of the other choices apply)

Checklist

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.

[harshitasao]

cc @yxxhero

[gaius-qi]

LGTM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.51%. Comparing base (d68e707) to head (0364ae7).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3440      +/-   ##
==========================================
- Coverage   52.64%   52.51%   -0.13%     
==========================================
  Files         194      194              
  Lines       20587    20587              
==========================================
- Hits        10837    10812      -25     
- Misses       8942     8963      +21     
- Partials      808      812       +4     

Flag	Coverage Δ
unittests	52.51% <ø> (-0.13%)	⬇️

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see 6 files with indirect coverage changes