Update README.md with OSSF Scorecard Badge

Author: SilanHe

README.md

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 # AWS Durable Execution SDKs for JavaScript
 
+[![OpenSSF Scorecard](https://api.scorecard.dev/projects/github.com/aws/aws-durable-execution-sdk-js/badge)](https://scorecard.dev/viewer/?uri=github.com/aws/aws-durable-execution-sdk-js)
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 This repository contains the code for the following 3 packages published to NPM:
 
 - [@aws/durable-execution-sdk-js](https://github.com/aws/aws-durable-execution-sdk-js/tree/main/packages/aws-durable-execution-sdk-js)