doc: add release note for CodeMeta block IQSS#7844

doc/release-notes/7844-codemeta.md

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+# Experimental CodeMeta Schema Support
+
+With this release, we are adding "experimental" (see note below) support for research software metadata deposits.
+
+By adding a metadata block for [CodeMeta](https://codemeta.github.io), we take another step extending the Dataverse
+scope being a research data repository towards first class support of diverse F.A.I.R. objects, currently focusing
+on research software and computational workflows.
+
+There is more work underway to make Dataverse installations around the world "research software ready". We hope
+for feedback from installations on the new metadata block to optimize and lift it from the experimental stage.
+
+**Note:** like the metadata block for computational workflows before, this schema is flagged as "experimental".
+"Experimental" means it's brand new, opt-in, and might need future tweaking based on experience of usage in the field.
+These blocks are listed here: https://guides.dataverse.org/en/latest/user/appendix.html#experimental-metadata