Add PrimeNG

1. npm install

npm install --save primeng
npm install --save primeui
npm install --save font-awesome

2. Add external font-awesome

3. Add external scripts and styles

    {src: 'primeui/primeui-ng-all.min.css', inject: true},
    {src: 'primeui/primeui-ng-all.min.js', inject: true}

Do you need add font-awesome.min.css to, you can modify seed.config.ts or proceed like above

/**
 * The list of local files to be injected in the `index.html`.
 * @type {InjectableDependency[]}
 */
APP_ASSETS: InjectableDependency[] = [
  { src: `${this.CSS_SRC}/main.${ this.getInjectableStyleExtension() }`, inject: true, vendor: false },
  { src: `${this.CSS_SRC}/font-awesome.min.css`, inject: true, vendor: true }
];

4. The configuration of SystemJS for the dev environment. Modify SYSTEM_CONFIG_DEV in seed.config.ts adding this:

'primeng': `${this.APP_BASE}node_modules/primeng`,

Example:

/**
 * The configuration of SystemJS for the `dev` environment.
 * @type {any}
 */
protected SYSTEM_CONFIG_DEV: any = {
  defaultJSExtensions: true,
  packageConfigPaths: [
    `${this.APP_BASE}node_modules/*/package.json`,
    `${this.APP_BASE}node_modules/**/package.json`,
    `${this.APP_BASE}node_modules/@angular/*/package.json`
  ],
  paths: {
    [this.BOOTSTRAP_MODULE]: `${this.APP_BASE}${this.BOOTSTRAP_MODULE}`,
    '@angular/core': `${this.APP_BASE}node_modules/@angular/core/core.umd.js`,
    '@angular/common': `${this.APP_BASE}node_modules/@angular/common/common.umd.js`,
    '@angular/compiler': `${this.APP_BASE}node_modules/@angular/compiler/compiler.umd.js`,
    '@angular/http': `${this.APP_BASE}node_modules/@angular/http/http.umd.js`,
    '@angular/router': `${this.APP_BASE}node_modules/@angular/router/router.umd.js`,
    '@angular/platform-browser': `${this.APP_BASE}node_modules/@angular/platform-browser/platform-browser.umd.js`,
    '@angular/platform-browser-dynamic': `${this.APP_BASE}node_modules/@angular/platform-browser-dynamic/platform-browser-dynamic.umd.js`,
    'rxjs/*': `${this.APP_BASE}node_modules/rxjs/*`,
    'primeng': `${this.APP_BASE}node_modules/primeng`,
    'app/*': `/app/*`,
    '*': `${this.APP_BASE}node_modules/*`
  },
  packages: {
    rxjs: { defaultExtension: false }
  }
};