Add Shopify external plugin

Author: durga256

plugins/external.json

@@ -138,5 +138,22 @@
       "source": "github",
       "repo": "figma/mcp-server-guide"
     }
+  },
+  {
+    "name": "shopify-plugins",
+    "description": "Shopify developer tools for building on the Shopify platform. Search Shopify docs, generate and validate GraphQL, Liquid, and UI extension code.",
+    "version": "1.0.0",
+    "author": {
+      "name": "Shopify",
+      "url": "https://www.shopify.com"
+    },
+    "homepage": "https://github.com/Shopify/shopify-plugins",
+    "keywords": ["shopify", "mcp", "graphql", "liquid", "storefront", "admin-api", "ecommerce"],
+    "license": "MIT",
+    "repository": "https://github.com/Shopify/shopify-plugins",
+    "source": {
+      "source": "github",
+      "repo": "Shopify/shopify-plugins"
+    }
   }
 ]