Update README.md to prevent issues between oc and blazor routing (#16835

)

Co-authored-by: Hisham Bin Ateya <hishamco_2007@yahoo.com>
Co-authored-by: Zoltán Lehóczky <zoltan.lehoczky@lombiq.com>

src/docs/guides/create-blazor-cms/README.md

@@ -730,6 +730,50 @@ Run the application. Click on the `Orchard Core` link on the Left Nav will load
 # Add multitenancy to the Blazor App
 One of the key features of Orchard Core is its multi-tenancy support. In this section, we will add multi-tenancy support to our Blazor application.
 
+!!! note
+    Orchard Core listens for requests, also on '/' (e.g. when a site needs to be configured). So having our Blazor app listening to '/' as well can pose a problem.
+    A solution is to replace `@page "/"` with `@page "/home"` in our `home.razor` file (and update our `navmenu.razor`), so Blazor (the app) will listen to `/home` while Orchard Core is not hindered by that.
+
+=== "Home.razor"
+
+    ```razor
+         @page "/home"
+         
+         <PageTitle>Home</PageTitle>
+         
+         <h1>Hello, Orchard!</h1>
+         
+         Welcome to your new Blazor CMS app.
+    ```
+
+=== "NavMenu.razor"
+
+    ```razor
+        <div class="top-row ps-3 navbar navbar-dark">
+            <div class="container-fluid">
+                <a class="navbar-brand" href="">BlazorCMS</a>
+            </div>
+        </div>
+        
+        <input type="checkbox" title="Navigation menu" class="navbar-toggler" />
+        
+        <div class="nav-scrollable" onclick="document.querySelector('.navbar-toggler').click()">
+            <nav class="flex-column">
+                <div class="nav-item px-3">
+                    <NavLink class="nav-link" href="home" Match="NavLinkMatch.All">
+                        <span class="bi bi-house-door-fill-nav-menu" aria-hidden="true"></span> Home
+                    </NavLink>
+                </div>
+                <div class="nav-item px-3">
+                    <NavLink class="nav-link" href="content">
+                        <span class="bi bi-list-nested-nav-menu" aria-hidden="true"></span> Orchard Core
+                    </NavLink>
+                </div>
+                @*More Nav links here *@
+            </nav>
+        </div>
+    ```
+
 ## Enable the tenant feature.
 
 In orchard core admin, go to `Configuration` -> `Features` and enable the `Tenants` feature.
@@ -985,4 +1029,4 @@ To further verify that there is now an active SignalR connection with the server
 
 In this guide, we have seen how to create a Blazor application, in a Razor class library, and serve it from an Orchard Core CMS application. We have seen how to add multi-tenancy support to the Blazor application, and how to make the Blazor application interactive.
 
-The source code for this guide is available at [github.com/OrchardCMS/OrchardCore.Samples](https://github.com/OrchardCMS/OrchardCore.Samples) 
+The source code for this guide is available at [github.com/OrchardCMS/OrchardCore.Samples](https://github.com/OrchardCMS/OrchardCore.Samples)