Add docs for build

[TimTheBig]

I'm interested in a build to add support to my own slicer however the lack of instructions is a big turn off

[xobes]

What is is you're looking for? A step-by-step for the physical build? Or software "build" instructions?

[TimTheBig]

A physical build guide would be great.

[jyjblrd]

Hi, unfortunately I don't have the time to make a build guide but please feel free to make one and upload it as a PR, it would really help the community

[xobes]

I will be doing this in the coming weeks, am doing a build presently and taking lots of pics

[xobes]

I have a lot of pictures, but I've also discovered I was missing some parts, so while I wait for those, I've made some modifications to several b-axis parts and so my "build instructions" and screw counts aren't going to be 100% aligned with the original -- partly due to the fact that I bought button-head screws instead of both flat-head and socket-cap screws.

I'll be starting the documentation in my fork, and will not deviations accordingly. I do think that these things will improve as more people go through the motions such that more optimizations can be made as things progress.