Angular cli, add bootstrap

Install bootstrap by npm

npm install bootstrap --save

Validate if package.json updated (/hello-world/package.json)

{
  "name": "hello-world",
  "version": "0.0.0",
  "license": "MIT",
  "scripts": {},
  "private": true,
  "dependencies": {
    ...
    "bootstrap": "^3.3.7",
    ...
  },
  "devDependencies": {}
}

Import css (/hello-world/src/styles.css)

@import "~bootstrap/dist/css/bootstrap.css";