title: Redoc side menu
body: <p>I want to use Redoc for my API documentation. I also have swagger.</p>
  <p>I found here : <a href="https://github.com/Redocly/redoc" rel="nofollow noreferrer">https://github.com/Redocly/redoc</a> this line - <strong>Integrate API Introduction into side menu - ReDoc takes advantage of markdown headings from OpenAPI description field. It pulls them into side menu and also supports deep linking.</strong></p>
  <p>I want to add my readme file to left side bar in Redoc. But I didn`t find any good example for it. What should I change, where readme should be added?</p>
  <p>My redoc setup :</p>
  <pre><code>app.UseReDoc(c =&gt;
              {
                  c.DocumentTitle = $&quot;Documentation&quot;;
                  c.SpecUrl = /api/docs/swagger.json&quot;;
                  c.RoutePrefix = &quot;docs&quot;;
              });
  </code></pre>