message: Add Marketplace URL to the plugin file
diff: "CreatedBy": "Cesium GS, Inc.",
  "CreatedByURL": "https://cesium.com",
  "DocsURL": "https://cesium.com/docs",
  - "MarketplaceURL": "",
  + "MarketplaceURL": "com.epicgames.launcher://ue/marketplace/content/87b0d05800a545d49bf858ef3458c4f7",
  "SupportURL": "https://community.cesium.com",
  "EngineVersion": "4.26.0",
  "CanContainContent": true,
  