Update README.md

Author: reuvenharrison

Diff for: README.md

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 ## Demo of using oasdiff in a github workflow
-Go to actions and see the summary
+This repo demonstrates how to use [oasdiff](https://github.com/Tufin/oasdiff) to check every change to an OpenAPI spec for breaking changes.  
+The [github workflow](https://github.com/oasdiff/github-demo/blob/main/.github/workflows/bc.yml) uses oasdiff to create a changelog which is displayed in the [GitHub Actions Summary](https://github.com/oasdiff/github-demo/actions/runs/9797247511).  
+
+Alternatively, you may use the [oasdiff-action](https://github.com/oasdiff/oasdiff-action).