Create beamNG documentation pages

[O1LER]

Create

https://docs.beammp.com/beamng/

from scratch

[O1LER]

But do we really want to do this, we could also just link to

https://documentation.beamng.com/

[purifiedfr]

In my personal opinion (however, I am rather new to BeamNG modding, so I might be wrong), the new BeamNG documentation seems rather incomplete, for example it just glosses over streams:

The example above is an example of app that uses the vehicles' streams (which is by far the most common case). However this is not always the case, the apps can be used for just about anything.

You then have to refer to the unmaintained documentation at wiki.beamng.com, only from there can you learn about streams.

Obviously this is just one example (with UI Apps), however, this is the case for quite a lot of things in the new documentation.
While the old one might be correct, that doesn't need to be the case for future versions.
Even if we didn't want to recreate new Documentation from scratch on BeamMP->BeamNG docs, we could at least link relevant resources, and correct updated information.

TL;DR: making a semi-maintained unofficial documentation that'd house "links" to already available resources could be nice.

[O1LER]

Keep the info basic, talk about the game engines threads VE/GE, basic file structure