Add game_template (#1180)

Adds a template / sample for games built in Flutter, with all the bells and whistles, like ads, in-app purchases, audio, main menu, settings, and so on.

Co-authored-by: Parker Lougheed
Co-authored-by: Shams Zakhour

game_template/pubspec.yaml

@@ -0,0 +1,58 @@
+name: game_template
+description: A mobile game built in Flutter.
+
+# Prevent accidental publishing to pub.dev.
+publish_to: 'none'
+
+version: 0.0.1+1
+
+environment:
+  sdk: ">=2.16.0 <3.0.0"
+
+dependencies:
+  flutter:
+    sdk: flutter
+
+  audioplayers: ^0.20.1
+  cupertino_icons: ^1.0.2
+  go_router: ^3.0.1
+  logging: ^1.0.2
+  provider: ^6.0.2
+  shared_preferences: ^2.0.13
+
+  # If you don't need one of the following dependencies,
+  # delete the relevant line below, and get rid of any Dart code
+  # that references the dependency.
+  firebase_core: ^1.15.0  # Needed for Crashlytics below
+  firebase_crashlytics: ^2.6.3  # Error reporting
+  games_services: ^2.0.7  # Achievements and leaderboards
+  google_mobile_ads: ^1.1.0  # Ads
+  in_app_purchase: ^3.0.1  # In-app purchases
+
+dev_dependencies:
+  flutter_test:
+    sdk: flutter
+
+  flutter_launcher_icons: ^0.9.2
+  flutter_lints: ^1.0.0
+  test: ^1.19.0
+
+flutter:
+  uses-material-design: true
+
+  assets:
+    - assets/images/
+    - assets/music/
+    - assets/sfx/
+
+  fonts:
+    - family: Permanent Marker
+      fonts:
+        - asset: assets/Permanent_Marker/PermanentMarker-Regular.ttf
+
+flutter_icons:
+  android: true
+  ios: true
+  image_path: "assets/icon.png"
+  adaptive_icon_background: "#FFFFFF"
+  adaptive_icon_foreground: "assets/icon-adaptive-foreground.png"