docs: Update README.md (ran-isenberg#666)

Author: ran-isenberg

README.md

@@ -6,6 +6,7 @@
 [![codecov](https://codecov.io/gh/ran-isenberg/aws-lambda-handler-cookbook/branch/main/graph/badge.svg?token=P2K7K4KICF)](https://codecov.io/gh/ran-isenberg/aws-lambda-handler-cookbook)
 ![version](https://img.shields.io/github/v/release/ran-isenberg/aws-lambda-handler-cookbook)
 ![github-star-badge](https://img.shields.io/github/stars/ran-isenberg/aws-lambda-handler-cookbook.svg?style=social)
+![OpenSSF Scorecard](https://api.securityscorecards.dev/projects/github.com/ran-isenberg/aws-lambda-handler-cookbook/badge)
 ![issues](https://img.shields.io/github/issues/ran-isenberg/aws-lambda-handler-cookbook)
 
 ![alt text](https://github.com/ran-isenberg/aws-lambda-handler-cookbook/blob/main/docs/media/banner.png?raw=true)