ground_suite: init template layout

Signed-off-by: Onur Özkan <work@onurozkan.dev>

ground_suite/README.md

@@ -0,0 +1,21 @@
+# Kaptan Ground Suite
+
+## Run
+
+```sh
+cd ground_suite
+flutter pub get
+flutter run -d linux
+```
+
+On NixOS, enter `nix shell nixpkgs#flutter` first.
+For web, use `flutter run -d chrome`.
+
+## Check
+
+```sh
+dart format --output=none --set-exit-if-changed lib
+flutter analyze
+flutter build web
+flutter build linux
+```