feat: add examples

Author: LeadcodeDev

example/input.dart

@@ -0,0 +1,32 @@
+import 'package:commander_ui/commander_ui.dart';
+
+final class Item {
+  final String name;
+  final int value;
+
+  Item(this.name, this.value);
+}
+
+Future<void> main() async {
+  StdinBuffer.initialize();
+
+  final input = Input(
+      answer: 'Please give us your name',
+      placeholder: 'firstname lastname',
+      validate: (value) =>
+      switch(value) {
+        String value when value
+            .trim()
+            .isNotEmpty => Ok(null),
+        _ => Err('Please provide a valid name')
+      }
+  );
+
+  final value = switch(await input.handle()) {
+    Ok(:final value) => 'My value is $value',
+    Err(:final error) => Exception('Error: $error'),
+    _ => 'Unknown',
+  };
+
+  print(value);
+}

example/select.dart

@@ -0,0 +1,29 @@
+import 'package:commander_ui/commander_ui.dart';
+
+final class Item {
+  final String name;
+  final int value;
+
+  Item(this.name, this.value);
+}
+
+Future<void> main() async {
+  StdinBuffer.initialize();
+
+  final select = Select(
+      answer: "Please select your best hello",
+      options: List.generate(20, (index) => Item('${index + 1}. Hello World', index + 1)),
+      placeholder: 'Type to filter',
+      selectedLineStyle: (line) => '${AsciiColors.green('❯')} ${AsciiColors.lightCyan(line)}',
+      unselectedLineStyle: (line) => '  $line',
+      onDisplay: (item) => item.name
+  );
+
+  final selected = switch(await select.handle()) {
+    Ok(:final value) => 'My value is ${value.value}',
+    Err(:final error) => Exception('Error: $error'),
+    _ => 'Unknown',
+  };
+
+  print(selected);
+}