Add info on how to obtain client ID and client secret

index.html

@@ -130,6 +130,9 @@ <h2 id="usage">Usage</h2>
     <span class="pl-c1">console</span>.log(<span class="pl-s">`Request failed with status: <span class="hljs-subst">${res.status}</span> <span class="hljs-subst">${res.statusText}</span>`</span>);
   });
 </code></pre>
+<p>Client ID and client secret are required to create a new SDK instance.
+See <a href="https://www.sharetribe.com/docs/integrations/getting-started-with-integration-api/#create-integration-api-application-in-flex-console">this article</a>
+to learn how to get them.</p>
 <h2 id="examples">Examples</h2>
 <p>See the
 <a href="https://github.com/sharetribe/flex-integration-api-examples">flex-integration-api-examples</a>