update extension package.json and add icon

Author: Brad Cornes

packages/tailwindcss-vscode/media/icon.png

@@ -1,6 +1,8 @@
 {
-  "name": "tailwindcss-vscode",
-  "description": "",
+  "name": "vscode-tailwindcss",
+  "displayName": "Tailwind CSS IntelliSense",
+  "description": "Tailwind CSS class name completion",
+  "preview": true,
   "author": "Brad Cornes <hello@bradley.dev>",
   "license": "MIT",
   "version": "0.0.1",
@@ -9,13 +11,24 @@
     "url": "https://github.com/bradlc/"
   },
   "publisher": "bradlc",
-  "categories": [],
   "keywords": [
-    "multi-root ready"
+    "tailwind",
+    "tailwindcss",
+    "css",
+    "intellisense",
+    "autocomplete",
+    "vscode"
   ],
   "engines": {
     "vscode": "^1.33.0"
   },
+  "categories": [
+    "Other"
+  ],
+  "galleryBanner": {
+    "color": "#f1f5f8"
+  },
+  "icon": "media/icon.png",
   "activationEvents": [
     "workspaceContains:**/{tailwind,tailwind.config,tailwind-config,.tailwindrc}.js"
   ],