message: chore(package): add some fields to package.json
diff: "main": "es/index.js",
  "module": "es/index.js",
  "typings": "es/index.d.ts",
  + "repository": "https://github.com/carbon-design-system/carbon-custom-elements",
  + "bugs": "https://github.com/carbon-design-system/carbon-custom-elements/issues",
  "files": [
  "es/**/*",
  "scss/**/*"
  ],
  + "keywords": [
  + "carbon",
  + "component",
  + "components",
  + "pattern",
  + "patterns",
  + "style guide",
  + "carbon-design-system",
  + "web components"
  + ],
  "scripts": {
  "build": "gulp build && yarn build:ngc",
  "build:ngc": "yarn build:ngc:esm2015 && yarn build:ngc:esm5",
  