German translations for aeon.cash, CLI, GUI and contributing.md

Why?

What problem(s) are you trying to solve?

Trnaslation into German

How much?

What is the total cost in AEON? List expenses per item. Total hours of work and per hour rate. What exchange rates are you using?

As per the bounty: 100 AEON for translating the GUI/CLI core and contributing files. As well as 100 AEON for translating the aeon.cash files.

What?

Describe your idea in detail.

German is one of the most spoken languages in Europe. Translating AEON into german will make it accessible for many new users.

Milestones?

Break down tasks into different stages. Each stage should have the estimated number of days/weeks needed and cost per stage.

Already done: https://github.com/AEONCommunity/Translations/pull/5

Outcomes?

What will be delivered? What goals will be reached?

Increasing the visibility and usability of AEON within the german speaking population.

Why you?

What skills and experience do you have?

I'm a native German speaker, living in the UK.