SnapMaker 2 Marlin 2 gCode Support

Hi Trek, thank you for your suggestions and we appreciate your input and here is the g-code reference file we have ready as of now for SM1. The g-code reference file for SM2 will be released in a month or two according to the plan. Sorry if the g-code reference file we have now is a bit bare boned, but we will refine it with time. Here is the link to the g-code reference file for SM1.