Adds first drafts for new techdocs

Hello everyone!

This pull requests contains the first round of draft documents.

This is still a WIP but I wanted to share the ideads of structuring and how to write a techdocs, at a very early stage, so everbody cant contribute or just share additional ideas on that.

Additional Note: Can we keep the a drafts branch we can work in frequently, without breaking the more "stable" versions in master? Would be amazing! :)

Thanks!

Cheers,
Dennis