Homogenize example modules

[matks]

Multiple items should be homogenized in example modules to make it easier for developers to navigate them.

• Module naming
• Namespace naming
• README
• Composer configuration (remember it needs "prepend-autoloader": false)
• Logo
• Folder structure
• License headers

[daresh]

As the example modules are a very nice resource to learn from, can you suggest which one of them has the final folder structure and namespace naming?