title: Automatically add scripts and styles in angular.json
body: <p>My goal is simply to add the scripts and styles automatically in angular.json using the command line.For example if I am installing bootstrap in my angular project using the following the command.</p>
  
  <pre><code>npm install bootstrap
  </code></pre>
  
  <p>I have to manually goto angular.json and add the bootstrap.min.css and bootstrap.min.js .</p>
  
  <pre><code>        "styles": [
            "src/styles.css",
            "node_modules/bootstrap/dist/css/bootstrap.min.css",
  
          ],
          "scripts": [
            "node_modules/jquery/dist/jquery.min.js",
            "node_modules/popper.js/dist/umd/popper.min.js",
            "node_modules/bootstrap/dist/js/bootstrap.min.js",
  
          ]
  </code></pre>
  
  <p>Is there a way to do this with a command ? The reason why I need this because i am using my custom library and have its dependencies installed.Since custom libraries dont have any angular.json , the custom library gets installed but could not figure out a way to add the scripts and styles.</p>