message: docs(aio): add angular-playground to resources
  PR Close
diff: "rev": true,
  "title": "NinjaCodeGen - Angular CRUD Generator",
  "url": "https://ninjaCodeGen.com"
  + },
  + "angular-playground": {
  + "desc": "UI development environment for building, testing, and documenting Angular applications.",
  + "rev": true,
  + "title": "Angular Playground",
  + "url": "http://www.angularplayground.it/"
  }
  }
  },
  