start implement generator code

examples/client_app/lib/foo.dart

@@ -0,0 +1,14 @@
+import 'package:cherrypick_annotations/cherrypick_annotations.dart';
+
+part 'foo.cherrypick_injectable.g.dart';
+
+@Injectable()
+class Foo {
+  late final String field;
+}
+
+// где-то в main:
+void iniFoo() {
+  $initCherrypickGenerated();
+  // ... остальной код
+}