Update plugin_integration.md

flutter_documentation/plugin_integration.md

@@ -5,6 +5,17 @@ parent: Flutter
 nav_order: 2
 ---
 
+## Prerequisites
+* Flutter version at least `2.10.5`
+### Android 
+* `minSdkVersion` at least `20`
+* `compileSdkVersion` at least `33`
+
+Note: if you are getting errors about using wrong `minSdkVersion` or `compileVersion` even though you have set them to the ones above (or higher), you need to find `build.gradle` files that has `flutter.minSdkVersion` and `flutter.compileSdkVersion` and  manually change those values.
+
+### iOS
+* Minimum deployment target at least `12.0`
+
 ## pubspec.yaml
 In your `pubspec.yaml` file’s dependencies add these lines to include Setupad's Prebid plugin for Flutter and run 'flutter pub get' command in terminal.
 ```yaml