add duckdb to registry

registry/duckdb/README.md

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+TODO: Update README with the Beta flow

registry/duckdb/metadata.json

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+{
+    "overview": {
+      "namespace": "hasura",
+      "description": "Connect to a DuckDB database and expose them to Hasura v3 Project",
+      "title": "(MotherDuck) DuckDB Native Data Connector",
+      "logo": "logo.svg",
+      "tags": [
+        "database"
+      ],
+      "latest_version": "v0.0.9"
+    },
+    "author": {
+      "support_email": "[email protected]",
+      "homepage": "https://hasura.io",
+      "name": "Hasura"
+    },
+    "is_verified": false,
+    "is_hosted_by_hasura": true,
+    "packages": [
+      {
+        "version": "0.0.9",
+        "uri": "https://github.com/hasura/ndc-duckdb/releases/download/v0.0.9/connector-definition.tgz",
+        "checksum": {
+          "type": "sha256",
+          "value": "1117ed3274a7cdab4ab61082cf860ad045d242e5e7ffb1ac8f76bb1053e63094"
+        },
+        "source": {
+          "hash": "5da63b6d05a87529967346b24f80d25bcf16f103"
+        }
+      }
+    ],
+    "source_code": {
+      "is_open_source": true,
+      "repository": "https://github.com/hasura/ndc-duckdb",
+      "version": [
+        {
+          "tag": "v0.0.9",
+          "hash": "5da63b6d05a87529967346b24f80d25bcf16f103",
+          "is_verified": false
+        }
+      ]
+    }
+  }