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)
• [x] 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?