Update README.md with 5.12 release info

README.md

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+# OVAL 5.12 Official Release
+
+**12/04/2024**
+After several years of work with contributions from numerous OVAL developers and board members, we are proud to announce the release of OVAL 5.12.  For a list of changes, please view:
+
+https://github.com/OVAL-Community/OVAL/issues?q=is%3Aissue+milestone%3A5.12+is%3Aclosed
+
+To download a copy of the OVAL 5.12 schema, and offline HTML files, view the following and download the release zips from the Assets.
+
+https://github.com/OVAL-Community/OVAL/releases/tag/v5.12
+
 # The OVAL Language Documentation
 
 For OVAL 5.12 Documentation https://oval-community-guidelines.readthedocs.io/en/latest/