New Example - Stateless MObX Counter App (#104)

Co-authored-by: A HEAD FULL OF DREAMS <workdeveloper@gmail.com>
Co-authored-by: Nishant Srivastava <nisrulz@users.noreply.github.com>

statless_counter_app/lib/counter.dart

@@ -0,0 +1,18 @@
+import 'package:mobx/mobx.dart';
+
+// Include generated file
+part 'counter.g.dart';
+
+// This is the class used by rest of your codebase
+class Counter = _Counter with _$Counter;
+
+// The store-class
+abstract class _Counter with Store {
+  @observable
+  int value = 0;
+
+  @action
+  void increment() {
+    value++;
+  }
+}