Add a description, image, and links to the grbl-simulator topic page so that developers can more easily learn about it.

It primarily relies on open-source GRBL firmware, which supports both CNC ... it's compatible with programs like ArtFusion 360, Easel, and Carbide Create, among others that support the mainboard.

In other words, this HCLI acts in the same capacity as the OpenBuilds CONTROL software and OpenBuilds Interface CNC Touch hardware to help control a GRBL v1.1g controlled CNC ...