Added prompt and control widgets

- Updated iOS portion of project
- Always to default landscape

lib/control.dart

@@ -0,0 +1,34 @@
+import 'package:flutter/material.dart';
+
+class Control extends StatefulWidget {
+  Control({Key? key}) : super(key: key);
+
+  @override
+  State<StatefulWidget> createState() => _ControlState();
+}
+
+class _ControlState extends State<Control> {
+  double _currentValue = 50.0;
+
+  @override
+  Widget build(BuildContext context) {
+    return Row(
+      mainAxisAlignment: MainAxisAlignment.center,
+      children: [
+        Text("1"),
+        Slider(
+          value: _currentValue,
+          onChanged: (newValue) {
+            setState(() {
+              _currentValue = newValue;
+              print(_currentValue);
+            });
+          },
+          min: 1.0,
+          max: 100.0,
+        ),
+        Text("100")
+      ],
+    );
+  }
+}