add extension icon

Author: snowystinger

packages/dev/style-macro-chrome-plugin/src/icons/128.png

@@ -8,5 +8,12 @@
     "js": ["content-script.js"],
     "all_frames": true,
     "run_at": "document_start"
-  }]
+  }],
+  "icons": {
+    "16": "icons/16.png",
+    "32": "icons/32.png",
+    "48": "icons/48.png",
+    "96": "icons/96.png",
+    "128": "icons/128.png"
+  }
 }