📖 README.md: Add OpenSSF Best Practices badge

[justaugustus]

• Please check if the PR fulfills these requirements

• (N/A) Tests for the changes have been added (for bug fixes / features)
• PR title follows the guidelines defined in https://github.com/ossf/scorecard/blob/main/CONTRIBUTING.md#pr-process

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

Part of #1618.

📖 README.md: Add OpenSSF Best Practices badge

Signed-off-by: Stephen Augustus [email protected]

• What is the current behavior? (You can also link to an open issue here)

• What is the new behavior (if this is a feature change)?

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)

• Other information:

[github-actions]

Integration tests success for
[d56d9e3]
(https://github.com/ossf/scorecard/actions/runs/1833480739)

[github-actions]

Integration tests success for
[b9a0fdc]
(https://github.com/ossf/scorecard/actions/runs/1833483777)

[codecov-commenter]

Codecov Report

Merging #1629 (d56d9e3) into main (2e3e505) will not change coverage.
The diff coverage is n/a.

❗ Current head d56d9e3 differs from pull request most recent head b9a0fdc. Consider uploading reports for the commit b9a0fdc to get more accurate results

@@           Coverage Diff           @@
##             main    #1629   +/-   ##
=======================================
  Coverage   55.64%   55.64%           
=======================================
  Files          72       72           
  Lines        6513     6513           
=======================================
  Hits         3624     3624           
  Misses       2647     2647           
  Partials      242      242           

[naveensrinivasan]

Thank you @justaugustus!