feat: add claude code plugin config

.claude-plugin/marketplace.json

@@ -0,0 +1,16 @@
+{
+  "name": "knowledge-catalog-marketplace",
+  "owner": {
+    "name": "Google LLC",
+    "email": "[email protected]"
+  },
+  "metadata": {
+    "description": "Agent skills for Knowledge Catalog to discover, manage, and monitor data and AI artifacts."
+  },
+  "plugins": [
+    {
+      "name": "knowledge-catalog",
+      "source": "./"
+    }
+  ]
+}

.claude-plugin/plugin.json

@@ -0,0 +1,21 @@
+{
+  "name": "knowledge-catalog",
+  "version": "0.4.0",
+  "description": "Connect to Knowledge Catalog to discover, manage, monitor, and govern data and AI artifacts across your data platform",
+  "author": {
+    "name": "Google LLC",
+    "email": "[email protected]"
+  },
+  "homepage": "https://cloud.google.com/dataplex",
+  "license": "Apache-2.0",
+  "repository": "https://github.com/gemini-cli-extensions/knowledge-catalog",
+  "skills": "./skills/",
+  "userConfig": {
+    "dataplex_project": {
+      "title": "Project ID",
+      "description": "ID of the Google Cloud project",
+      "type": "string",
+      "sensitive": false
+    }
+  }
+}