chore: initial padel scaffold + design docs

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

source/garmin-padelApp.mc

@@ -0,0 +1,28 @@
+import Toybox.Application;
+import Toybox.Lang;
+import Toybox.WatchUi;
+
+class garmin_padelApp extends Application.AppBase {
+
+    function initialize() {
+        AppBase.initialize();
+    }
+
+    // onStart() is called on application start up
+    function onStart(state as Dictionary?) as Void {
+    }
+
+    // onStop() is called when your application is exiting
+    function onStop(state as Dictionary?) as Void {
+    }
+
+    // Return the initial view of your application here
+    function getInitialView() as [Views] or [Views, InputDelegates] {
+        return [ new garmin_padelView(), new garmin_padelDelegate() ];
+    }
+
+}
+
+function getApp() as garmin_padelApp {
+    return Application.getApp() as garmin_padelApp;
+}