Add draft for RFC-13 (Versioning)

rfc/11/index.md

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+---
+manual_status: D1
+status_note: reserved, under preparation
+description: Core Concepts
+---
+
+# RFC-11: Core Concepts
+
+```{toctree}
+:hidden:
+:maxdepth: 1
+comments/index
+```
+
+RFC-11 has been reserved for the topic (Core Concepts), but is still under preparation.
+
+## Status
+
+```{rfc-status}
+```

rfc/12/index.md

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+---
+manual_status: D1
+status_note: reserved, under preparation
+description: Future Metadata RFC
+---
+
+# RFC-12: Future Metadata RFC
+
+```{toctree}
+:hidden:
+:maxdepth: 1
+comments/index
+```
+
+RFC-12 has been reserved for the general topic of "Metadata", but is still under preparation.
+
+## Status
+
+```{rfc-status}
+```