docs(contributing): explain naming schemes for code style

[dargmuesli]

The contributing guide currently does not specify naming schemes for properties or variables, like alphabetical sorting or the preference to name an entity first, data type – if even necessary – second. Examples should be given.

These conventions aim to keep the code style consistent and standard DX pain points away as the project grows, especially for future developers.

[dargmuesli]

Waiting for:

• docs: add contribution guide #76

[sthelemann]

What exactly are you waiting for?

[dargmuesli]

The linked pull request that I've merged three days ago, so this issue is not in waiting state anymore. I'll update its state now.