New Example - Platform Adaptive Example (#121)

* Adding Platform Adaptive Example

* Adding screenshots

using_platform_adaptive/lib/common_widgets/adaptive_button.dart

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+import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+import 'package:using_platform_adaptive/platform_adaptive.dart';
+
+class AdaptiveButton extends PlatformAdaptiveWidget {
+  const AdaptiveButton(
+      {super.forcePlatform,
+      this.color,
+      required this.child,
+      this.onPressed,
+      super.key});
+
+  final void Function()? onPressed;
+  final Widget child;
+  final Color? color;
+
+  @override
+  Widget buildAndroid(BuildContext context) {
+    return MaterialButton(
+      onPressed: onPressed,
+      color: color,
+      child: child,
+    );
+  }
+
+  @override
+  Widget buildIOS(BuildContext context) {
+    return CupertinoButton(
+      onPressed: onPressed,
+      color: color,
+      child: child,
+    );
+  }
+}

using_platform_adaptive/lib/common_widgets/adaptive_date_picker.dart

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+import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+import 'package:using_platform_adaptive/platform_adaptive.dart';
+
+class AdaptiveDialog extends PlatformAdaptiveWidget {
+  const AdaptiveDialog(
+      {super.key,
+      super.forcePlatform,
+      required this.title,
+      required this.actions,
+      this.content});
+
+  final String title;
+  final Widget? content;
+  final List<AdaptiveDialogAction> actions;
+
+  @override
+  Widget buildAndroid(BuildContext context) {
+    return AlertDialog(
+      title: Text(title),
+      content: content,
+      actions: actions,
+    );
+  }
+
+  @override
+  Widget buildIOS(BuildContext context) {
+    return CupertinoAlertDialog(
+      title: Text(title),
+      content: content,
+      actions: actions,
+    );
+  }
+}
+
+class AdaptiveDialogAction extends PlatformAdaptiveWidget {
+  const AdaptiveDialogAction(
+      {super.forcePlatform, this.onPressed, required this.text, super.key});
+
+  final void Function()? onPressed;
+  final String text;
+
+  @override
+  Widget buildAndroid(BuildContext context) {
+    return TextButton(onPressed: onPressed, child: Text(text));
+  }
+
+  @override
+  Widget buildIOS(BuildContext context) {
+    return CupertinoDialogAction(onPressed: onPressed, child: Text(text));
+  }
+}

using_platform_adaptive/lib/common_widgets/adaptive_indicator.dart

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+import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+import 'package:using_platform_adaptive/platform_adaptive.dart';
+
+class AdaptiveIndicator extends PlatformAdaptiveWidget {
+  const AdaptiveIndicator({super.forcePlatform, super.key});
+
+  @override
+  Widget buildAndroid(BuildContext context) {
+    return const CircularProgressIndicator();
+  }
+
+  @override
+  Widget buildIOS(BuildContext context) {
+    return const CupertinoActivityIndicator();
+  }
+}