Task: Add cubetiq dart shared library and functions and utils and extensions for developers and completed with configurable

example/cubetiq_configurable_example.dart

@@ -0,0 +1,14 @@
+import 'package:cubetiq/configurable.dart'
+    show 
+    SystemConfig, 
+    getConfigOrNull, 
+    SimpleConfigurationProvider,
+    setConfig;
+
+void main() {
+  SystemConfig.setProvider(SimpleConfigurationProvider());
+  setConfig('hello', 'Be the World!');
+
+  var title = getConfigOrNull('hello', defaultValue: 'Just Hello');
+  print(title);
+}

example/cubetiq_dart_shared_example.dart

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