Snapmaker 2.0 SBR16 linear guides support

# Adapters for linear guides for the Snapmaker 2.0
To reduce the wobbling of the build plate I have installed linear guides that provide additional support. These adapters help to connect the guides to the buildplate.

Especially when doing cnc tasks, the buildplate can be pushed down by the toolhead. This results in less accurate work and may reduce the quality of your work. Some people also report some instability of the platform in general. However, this can vary between different devices.

A wonderful job was already done by [3DNate](https://www.thingiverse.com/3dnate/) with this design: https://www.thingiverse.com/thing:4860729
The only drawback, you need to accurately measure the the height, print and make sure it fits and/or create intermediate pieces to the exact needed height. I wanted to make this adjustable so it's easier to install and use.

Therefore a simple design was created with a nut that can be adjusted. Similar to how a lot of tables can be leveled by t