Create branding.md

added the help text for branding page

docs/docs/help/User Menu/Console/branding.md

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+---
+sidebar_position: 4
+title: Branding
+---
+
+# 🔧 Branding
+
+## **Custom Subdomain**
+This page is accessible only to **Enterprise** users. Here, users can configure their own custom subdomain and access the OpenSign application directly through it.
+
+---
+
+## **App Name**
+Users can set a custom application name to reflect their brand identity.  
+This name will appear in custom template page titles and other areas across the application, helping maintain consistent branding.
+
+---
+
+## **App Logo**
+Users can upload their own logo to display within the application instead of the default OpenSign logo, reinforcing their brand presence.