add running instructions

Author: grdsdev

Examples/README.md

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+# Examples
+
+This directory contains example applications demonstrating the usage of Supabase Swift SDK.
+
+## Prerequisites
+
+[Requirements](../README.md#requirements)
+
+## Running the Examples App
+
+1. Open the `Examples.xcodeproj` file in Xcode
+2. Select your target device or simulator
+3. Build and run the project (⌘R)
+
+## Authentication Setup
+
+### Google Sign-In Setup
+
+To enable Google Sign-In in the examples app:
+
+1. Create a project in the [Google Cloud Console](https://console.cloud.google.com/)
+2. Enable the Google Sign-In API
+3. Create OAuth 2.0 credentials for iOS
+4. Update the `Info.plist` file with your credentials:
+   - Replace `{{ YOUR_IOS_CLIENT_ID }}` with your iOS client ID
+   - Replace `{{ YOUR_SERVER_CLIENT_ID }}` with your server client ID
+   - Replace `{{ DOT_REVERSED_IOS_CLIENT_ID }}` with your reversed client ID
+
+### Facebook Sign-In Setup
+
+To enable Facebook Sign-In in the examples app:
+
+1. Create an app in the [Facebook Developers Console](https://developers.facebook.com/)
+2. Add iOS platform to your Facebook app
+3. Update the `Info.plist` file with your Facebook credentials:
+   - Replace `{{ FACEBOOK APP ID }}` with your Facebook App ID
+   - Replace `{{ FACEBOOK CLIENT TOKEN }}` with your Facebook Client Token