code: protected function initNavigation()
      {
          Yii::$app->params['nav']['wavecms_dashboard'] = [
              'label' => FontAwesome::icon('home') . Yii::t('wavecms/main', 'Dashboard'),
              'url' => ['/'],
              'position' => 500
          ];
  
          Yii::$app->params['nav']['wavecms_user'] = [
              'label' => FontAwesome::icon('users') . Yii::t('wavecms/user', 'Users'),
              'url' => 'javascript: ;',
              'options' => [
                  'class' => 'drop-down'
              ],
              'permission' => 'wavecms-user',
              'position' => 9000,
              'items' => [
                  [
                      'label' => FontAwesome::icon('user') . Yii::t('wavecms/user', 'List of users'),
                      'url' => ['/wavecms/user/index']
                  ],
                  [
                      'label' => FontAwesome::icon('key') . Yii::t('wavecms/user', 'Roles'),
                      'url' => ['/wavecms/role/index']
                  ],
              ]
          ];
  
          Yii::$app->params['nav']['wavecms_settings'] = [
              'label' => FontAwesome::icon('cog') . Yii::t('wavecms/main', 'Settings'),
              'url' => 'javascript: ;',
              'options' => [
                  'class' => 'drop-down'
              ],
              'permission' => 'wavecms-settings',
              'position' => 10000,
              'items' => [
                  [
                      'label' => FontAwesome::icon('flag') . Yii::t('wavecms/main', 'Translations'),
                      'url' => ['/wavecms/translation/index']
                  ],
                  [
                      'label' => FontAwesome::icon('database') . Yii::t('wavecms/main', 'Cache'),
                      'url' => ['/wavecms/settings/cache']
                  ]
              ]
          ];
      }
docs: Init left navigation