message: Add schema support for appsettings.json
diff: }
  },
  "jsonValidation": [
  + {
  + "fileMatch": [
  + "appsettings.json",
  + "appsettings.*.json"
  + ],
  + "url": "https://json.schemastore.org/appsettings"
  + },
  {
  "fileMatch": "project.json",
  "url": "http://json.schemastore.org/project"
  