chore: add icon + update desc and name

Author: rx-dev

package.json

@@ -1,10 +1,10 @@
 {
     "name": "syntax-mcfunction",
     "publisher": "MinecraftCommands",
-    "displayName": "Mcfunction Syntax",
-    "description": "Syntax highlighting for mcfunction files",
+    "displayName": "syntax-mcfunction",
+    "description": "Syntax highlighting for mcfunction files (Last Updated: 1.20.2)",
+    "icon": "icon.png",
     "author": "MinecraftCommands",
-    "private": true,
     "version": "0.4.0",
     "license": "MIT",
     "repository": {