added (very) simple icon to app

android/app/src/main/AndroidManifest.xml

@@ -2,7 +2,7 @@
     package="net.broodjeaap.pizzaplanner.pizzaplanner">
    <application
         android:label="pizzaplanner"
-        android:icon="@mipmap/ic_launcher">
+        android:icon="@mipmap/app_icon">
         <activity
             android:name=".MainActivity"
             android:launchMode="singleTop"

ios/Runner.xcodeproj/project.pbxproj

@@ -468,4 +468,4 @@
 /* End XCConfigurationList section */
 	};
 	rootObject = 97C146E61CF9000F007C117D /* Project object */;
-}
+}

pubspec.yaml

@@ -45,6 +45,14 @@ dev_dependencies:
   hive_generator: ^1.1.0
   build_runner: ^2.0.6
 
+  flutter_launcher_icons: ^0.9.1
+
+flutter_icons:
+  android: "app_icon"
+  ios: true
+  remove_alpha_ios: true
+  image_path: "assets/icon/icon.png"
+
 # For information on the generic Dart part of this file, see the
 # following page: https://dart.dev/tools/pub/pubspec