feat: add Auth0 SSO docs (#456)

Author: nazarewk

public/docs-static/img/how-to-guides/single-sign-on/auth0-idp/application-configure.png

@@ -202,3 +202,44 @@ We recommend using a secure channel to share the Client’s secret. You can send
 - https://onetimesecret.com/en/ <br/>
 - https://password.link/en <br/>
 </Note>
+
+### Auth0
+
+1. Access the [Auth0 console](https://manage.auth0.com/) and navigate to Applications > Applications
+
+2. Click **+ Create Application**
+
+3. Enter **NetBird** as the name, select **Single Page Web Applications** as the application type and click **Create**
+
+<p>
+    <img src="/docs-static/img/how-to-guides/single-sign-on/auth0-idp/application-create.png" alt="auth0-application-create" className="imagewrapper-big"/>
+</p>
+
+4. On the New Application screen, go to the Settings tab and under Application URIs set the following values:
+- Application Login URI: https://app.netbird.io
+- Allowed Callback URLs: https://login.netbird.io/login/callback
+- Allowed Logout URLs: https://app.netbird.io
+- Allowed Web Origins: https://app.netbird.io
+
+<p>
+    <img src="/docs-static/img/how-to-guides/single-sign-on/auth0-idp/application-configure.png" alt="auth0-application-configure" className="imagewrapper-big"/>
+</p>
+
+6. Record the **Client ID** and **Client Secret** that Auth0 generates for your application.
+
+7. Retrieve Application's **Domain** from the **Basic Information** tab
+
+<p>
+    <img src="/docs-static/img/how-to-guides/single-sign-on/auth0-idp/application-domain.png" alt="auth0-application-domain" className="imagewrapper-big"/>
+</p>
+
+8. Share following with our team. Please use a secure method for sharing the sensitive parts of this information:
+   1. Application's **Domain**,
+   2. (sensitive) **Client ID** and **Client Secret**,
+   3. list of email domains to be registered for this SSO configuration,
+
+<Note>
+We recommend using a secure channel to share the Client’s secret. You can send a separate email and use a secret sharing service like: <br/>
+- https://onetimesecret.com/en/ <br/>
+- https://password.link/en <br/>
+</Note>