title: CakePHP 3 - How to install Theme Plugin including assets with Composer?
body: <p>I am in the process of creating a theme plugin for CakePHP 3, which will enable all of us to quickly bake admin panel with a high quality user interface.</p>
  
  <p>Besides cakephp plugin files, there have many assets files that should installed in /plugins/Admin/webroot/ css, js, img folder.</p>
  
  <p>It would be nice, if possible assets files installed from the 'required' repository.</p>
  
  <p>I have so far only used the composer to install plug-ins, I did not pay attention to where and how it works.</p>
  
  <p>This is the default plugin composer files, which will 'Admin plugin' installed in the right place.</p>
  
  <pre><code>{
      "name": "Salines/Admin",
      "description": "Admin plugin for CakePHP",
      "type": "cakephp-plugin",
      "require": {
          "php": "&gt;=5.4",
          "cakephp/cakephp": "3.0.x-dev"
      },
      "require-dev": {
          "phpunit/phpunit": "*"
      },
      "autoload": {
          "psr-4": {
              "Admin\\": "src"
          }
      },
      "autoload-dev": {
          "psr-4": {
              "Admin\\Test\\": "tests",
              "Cake\\Test\\": "./vendor/cakephp/cakephp/tests"
          }
      }
  }
  </code></pre>
  
  <p>What should be added to this file that I eg twitter bootstrap instead of the vendor folder. installed in Webroot?</p>