intro blog post in README.md

Author: felickz

README.md

@@ -12,7 +12,8 @@
 </div>
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-Collection of community-driven CodeQL query, library and extension packs
+Collection of community-driven CodeQL query, library and extension packs.
+- A detailed introduction via the GitHub Blog: [Announcing CodeQL Community Packs](https://github.blog/security/vulnerability-research/announcing-codeql-community-packs/)
 
 ## Getting started