feat: Add Claude plugin configuration (#106)

Author: twishabansal

.claude-plugin/marketplace.json

@@ -0,0 +1,16 @@
+{
+  "name": "cloud-sql-sqlserver-marketplace",
+  "owner": {
+    "name": "Google LLC",
+    "email": "data-cloud-ai-integrations@google.com"
+  },
+  "metadata": {
+    "description": "Agent skills for Cloud SQL for SQL Server to query, manage, and monitor databases."
+  },
+  "plugins": [
+    {
+      "name": "cloud-sql-sqlserver",
+      "source": "./"
+    }
+  ]
+}

.claude-plugin/plugin.json

@@ -0,0 +1,57 @@
+{
+  "name": "cloud-sql-sqlserver",
+  "version": "0.1.8",
+  "description": "Connect to Cloud SQL for SQL Server",
+  "author": {
+    "name": "Google LLC",
+    "email": "data-cloud-ai-integrations@google.com"
+  },
+  "homepage": "https://cloud.google.com/sql/docs/sqlserver",
+  "license": "Apache-2.0",
+  "repository": "https://github.com/gemini-cli-extensions/cloud-sql-sqlserver",
+  "skills": "./skills/",
+  "userConfig": {
+    "cloud_sql_mssql_project": {
+      "title": "Project Name",
+      "description": "Name of the Google Cloud project",
+      "type": "string",
+      "sensitive": false
+    },
+    "cloud_sql_mssql_region": {
+      "title": "Region",
+      "description": "Region of the Cloud SQL instance",
+      "type": "string",
+      "sensitive": false
+    },
+    "cloud_sql_mssql_instance": {
+      "title": "Instance ID",
+      "description": "ID of the Cloud SQL instance",
+      "type": "string",
+      "sensitive": false
+    },
+    "cloud_sql_mssql_database": {
+      "title": "Database",
+      "description": "Name of the database",
+      "type": "string",
+      "sensitive": false
+    },
+    "cloud_sql_mssql_user": {
+      "title": "User",
+      "description": "Username of the database user",
+      "type": "string",
+      "sensitive": false
+    },
+    "cloud_sql_mssql_password": {
+      "title": "Password",
+      "description": "Password of the database user",
+      "type": "string",
+      "sensitive": false
+    },
+    "cloud_sql_mssql_ip_type": {
+      "title": "Instance IP assignment",
+      "description": "(Optional) Type of the IP address: PUBLIC, PRIVATE, or PSC (Default: Public)",
+      "type": "string",
+      "sensitive": false
+    }
+  }
+}