Inject Experience Editor Assets Configuration

InjectExperienceEditorAssets.config

<configuration xmlns:patch="http://www.sitecore.net/xmlconfig/">
  <sitecore>    
    <pipelines>
      <processor type="EditorEnhancementToolkit.Foundation.ContentEditor.Pipelines.RenderRenderer.InjectExperiencEditorAssets,EditorEnhancementToolkit.Foundation.ContentEditor">
          <styles hint="list:addStyleResource">
            <resource>/sitecore modules/Shell/Editor Enhancement Toolkit/Resources/EditorEnhancementToolkit.css</resource>
          </styles>
        </processor>
     </pipelines>
  </sitecore>
</configuration>