initializate client, server, shared

- initializated base structure of server
 - initializated base structure of client
 - initializated base structure of shared(lib for client and server)

shared/example/shared_example.dart

@@ -0,0 +1,6 @@
+import 'package:shared/shared.dart';
+
+void main() {
+  var awesome = Awesome();
+  print('awesome: ${awesome.isAwesome}');
+}