chore: webgl quick start guide

WebGL.md

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+# Implementing Unity-Immutable-SDK for WebGL
+
+This guide provides focused instructions for implementing the Unity-Immutable-SDK in WebGL projects.
+
+For general information on the SDK, please refer to
+the [Unity-Immutable-SDK documentation](https://docs.immutable.com/sdks/zkEVM/unity).
+
+Live example can be found at https://immutable.github.io/unity-immutable-sdk/sample/webgl
+
+## WebGL Template Setup
+
+1. Navigate to `sample/Assets/WebGLTemplates/unity-webview/`.
+
+2. Copy the following files to your WebGLTemplates folder:
+   - `unity-webview.js`
+   - `callback.html`
+   - `logout.html`
+   - `Passport/index.html`
+
+3. Add the following script tag to your `index.html`:
+   ```html
+   <script src="unity-webview.js"></script>
+   ```
+
+## PKCE Login and Logout Implementation
+WebGL supports only PKCE flow. Follow these steps for implementation:
+
+1. Define a deep link scheme for your game:
+   - Login: https://game.domain.com/callback.html
+   - Logout: https://game.domain.com/logout.html
+
+2. Configure Immutable Hub:
+   - Login to [Immutable Hub](https:hub.immutable.com)
+   - Add these deep links to your client's Redirect URLs and Logout URLs
+
+3. Update Passport initialization:
+```csharp
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using Immutable.Passport;
+
+public class InitPassport : MonoBehaviour
+{
+    private Passport passport;
+
+    async void Start()
+    {
+        string clientId = "YOUR_IMMUTABLE_CLIENT_ID";
+        string environment = Immutable.Passport.Model.Environment.SANDBOX;
+        string redirectUri = "https://game.domain.com/callback.html";
+        string logoutRedirectUri = "https://game.domain.com/logout.html";
+        passport = await Passport.Init(clientId, environment, redirectUri, logoutRedirectUri);
+    }
+}
+```
+
+## Building for WebGL
+1. Go to File > Build Settings
+2. Select WebGL as the target platform
+3. Click "Build And Run"
+4. Choose a directory for the build output
+Your WebGL application will open in your default web browser once the build is complete.
+
+For a complete working example, refer to the sample application in the SDK repository.