Make project structure more clear in Creating a GWT component manual

[Flaurite]

Environment

• Documentation version: 7.2
• Part of the documentation: Manual
• Existing page: gwt_component_sample.html

Description of the bug or enhancement

Support forum: topic

It is not completely clear in this manual where classes should be placed: web-toolkit or web modules. As a suggestion it would be helpful if we add an image with a completed project structure (packages, classes).

[IskandarovRost]

Please clarify which class should be in which module and package. As it is easy to make a mistake and nothing works.

[Flaurite]

@IskandarovRost see support forum link in the description, there a working demo project