Update README.md

Author: intitni

README.md

@@ -90,8 +90,13 @@ Open the app, the app will create a launch agent to setup a background running S
 
 Enable the extension in `System Settings.app`.
 
+#### macOS 15
+From the Apple menu located in the top-left corner of your screen click `System Settings`. Navigate to `General` then `Login Items & Extensions`. Click `Xcode Source Editor` and tick `Copilot for Xcode`.
+
+#### MacOS 14
 From the Apple menu located in the top-left corner of your screen click `System Settings`. Navigate to `Privacy & Security` then toward the bottom click `Extensions`. Click `Xcode Source Editor` and tick `Copilot`.
 
+#### Older Versions
 If you are using macOS Monterey, enter the `Extensions` menu in `System Preferences.app` with its dedicated icon.
 
 ### Granting Permissions to the App