Adding D1 glossary.

Author: Oxyjun

src/content/docs/d1/reference/glossary.mdx

@@ -0,0 +1,13 @@
+---
+title: Glossary
+pcx_content_type: glossary
+sidebar:
+  order: 12
+
+---
+
+import { Glossary } from "~/components"
+
+Review the definitions for terms used across Cloudflare's D1 documentation.
+
+<Glossary product="d1" />