ng: add page (#2579)

pages/common/ng.md

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+# ng
+
+> Command Line Interface (CLI) for creating and managing Angular applications.
+
+- Create a new Angular application inside a folder:
+
+`ng new {{project_name}}`
+
+- Add a new component to one's application:
+
+`ng generate component {{component_name}}`
+
+- Add a new class to one's application:
+
+`ng generate class {{class_name}}`
+
+- Add a new directive to one's application:
+
+`ng generate directive {{directive_name}}`
+
+- Run the application with the following command in its root directory:
+
+`ng serve`
+
+- Build the application:
+
+`ng build`
+
+- Run unit tests:
+
+`ng test`
+
+- Check the version of your current Angular installation:
+
+`ng version`