Add quick start guide for UltimateAuth setup

Added a quick start guide for setting up UltimateAuth with Blazor Server, including project creation, package installation, service configuration, middleware setup, and first login example.

Author: mckaragoz

docs/content/getting-started/quickstart.md

@@ -0,0 +1,100 @@
+# ⚡ Quick Start
+
+In this guide, you will set up UltimateAuth in a few minutes and perform your **first login**.
+
+---
+
+## 1. Create a Project
+
+Create a new Blazor Server web app:
+
+```bash
+dotnet new blazorserver -n UltimateAuthDemo
+cd UltimateAuthDemo
+```
+
+## 2. Install Packages
+
+Add UltimateAuth packages:
+
+```csharp
+dotnet add package CodeBeam.UltimateAuth.Server
+dotnet add package CodeBeam.UltimateAuth.Client.Blazor
+dotnet add package CodeBeam.UltimateAuth.InMemory.Bundle
+```
+
+## 3. Configure Services
+
+Update your Program.cs:
+```csharp
+builder.Services
+    .AddUltimateAuthServer()
+    .AddUltimateAuthInMemory();
+
+builder.Services
+    .AddUltimateAuthClientBlazor();
+```
+
+## 4. Configure Middleware
+In `Program.cs`
+```csharp
+app.UseUltimateAuthWithAspNetCore();
+app.MapUltimateAuthEndpoints();
+```
+
+## 5. Enable Blazor Integration
+In `Program.cs`
+```csharp
+app.MapRazorComponents<App>()
+    .AddInteractiveServerRenderMode() // or webassembly (depends on your application type)
+    .AddUltimateAuthRoutes(UAuthAssemblies.BlazorClient());
+```
+
+## 6. Add UAuth Script
+Add this to `App.razor` or `index.html`:
+
+```csharp
+<script src="_content/CodeBeam.UltimateAuth.Client.Blazor/uauth.min.js"></script>
+```
+
+## 7. Configure Application Lifecycle
+Replace `Routes.razor` with this code:
+```csharp
+<UAuthApp UseBuiltInRouter="true" AppAssembly="typeof(Program).Assembly" DefaultLayout="typeof(Layout.MainLayout)" />
+```
+
+## 8. Perform Your First Login
+Example using IUAuthClient:
+```csharp
+[Inject] IUAuthClient UAuthClient { get; set; } = null!;
+
+private async Task Login()
+{
+    await UAuthClient.Flows.LoginAsync(new LoginRequest
+    {
+        Identifier = "demo",
+        Secret = "password"
+    });
+}
+```
+
+## 🎉 That’s It
+You now have a working authentication system with:
+
+- Session-based authentication
+- Automatic client detection
+- Built-in login flow
+- Secure session handling
+
+## What Just Happened?
+
+When you logged in:
+
+- A session (with root and chain) was created on the server,
+- Your client received an authentication grant (cookie or token),
+- UltimateAuth established your auth state automatically.
+
+👉 You didn’t manage cookies, tokens, or redirects manually.
+
+## Next Steps
+Discover the setup for real world applications with entity framework core.