Add MVC integration documentation

Co-authored-by: ADefWebserver <1857799+ADefWebserver@users.noreply.github.com>

Author: Copilot

MVC_INTEGRATION.md

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+# MVC Integration with Blazor 9
+
+This application now supports both ASP.NET Core MVC and Blazor components running side-by-side.
+
+## Architecture
+
+The application follows the integration pattern described in [Microsoft's Blazor Component Integration documentation](https://learn.microsoft.com/en-us/aspnet/core/blazor/components/integration?view=aspnetcore-9.0).
+
+### Key Components
+
+1. **Program.cs Configuration**
+   - `AddControllersWithViews()` - Adds MVC services
+   - `AddRazorPages()` - Adds Razor Pages support
+   - `MapControllerRoute()` - Maps traditional MVC routes
+   - `MapRazorPages()` - Maps Razor Pages routes
+   - `MapRazorComponents<App>()` - Maps Blazor components
+
+2. **MVC Structure**
+   - `Controllers/` - Contains MVC controllers (e.g., HomeController)
+   - `Views/` - Contains Razor views (.cshtml files)
+   - `Views/Shared/` - Shared layouts and partial views
+   - `Views/_ViewImports.cshtml` - Global imports for views
+   - `Views/_ViewStart.cshtml` - Default layout configuration
+
+## Routing
+
+- **MVC Routes**: `/Home/Index`, `/Home/About` (follows pattern: `/{controller}/{action}`)
+- **Blazor Routes**: `/` (root) and all other routes defined in Blazor components
+
+## Usage
+
+### Access MVC Views
+Navigate to:
+- http://localhost:5168/Home/Index - MVC home page
+- http://localhost:5168/Home/About - MVC about page
+
+### Access Blazor App
+Navigate to:
+- http://localhost:5168/ - Blazor application root
+
+## Benefits of This Integration
+
+1. **Gradual Migration**: Existing MVC applications can gradually adopt Blazor
+2. **Best of Both Worlds**: Use MVC for traditional request/response scenarios, Blazor for rich interactive experiences
+3. **Shared Infrastructure**: Both MVC and Blazor share the same middleware pipeline and services
+4. **SEO Friendly**: MVC views can provide server-rendered content for better SEO
+
+## Development
+
+The application uses .NET 9 and follows standard ASP.NET Core conventions:
+- Controllers inherit from `Controller`
+- Views use Razor syntax (.cshtml)
+- Blazor components use Razor component syntax (.razor)
+
+## Building and Running
+
+```bash
+# Build the solution
+dotnet build RFPAPP.sln
+
+# Run the application
+cd RFPResponsePOC/RFPResponsePOC
+dotnet run
+```
+
+The application will start on http://localhost:5168 (or https://localhost:7150 for HTTPS).