Add FAQ structures and questions

[MaxHillebrand]

We have many questions, now we need the answers!!

I suggest this rough structure General Bitcoin privacy, Introduction to Wasabi, Installation of Wasabi, Use of Wasabi- Wallet Manager - Receive - Send - History - Coin Join - Hardware Wallet, Contributions to Wasabi.

Of course, open for re-structuring, and changes / additions to the questions.

This addresses #3.

[raindogdance]

This is a fantastic list of questions! Great job.

Perhaps good to add something like "What are best practices when using Wasabi?" or "What is coin control and why is it important?" in the Introduction to Wasabi section? This question is answered through out the guide (esp. in the Use of Wasabi section), but perhaps it's good to have it all summed up in a few sentences with links to the appropriate sections of the guide. I think a lot of people will just glance over the first part of the FAQ and not reading further (except if they have particular questions), so they'd have at least some rough guidelines. But perhaps it's redundant, as it's covered in other sections of the FAQ.