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/test/shared_test.dart

@@ -0,0 +1,16 @@
+import 'package:shared/shared.dart';
+import 'package:test/test.dart';
+
+void main() {
+  group('A group of tests', () {
+    final awesome = Awesome();
+
+    setUp(() {
+      // Additional setup goes here.
+    });
+
+    test('First Test', () {
+      expect(awesome.isAwesome, isTrue);
+    });
+  });
+}