The schematics have been created using the EasyEDA editor, to load them you can open the document via: Top menu - File - Open - EasyEDA... , and select the json file. Once you open it in the editor you can save it into a project.
Note that the schematics as provided here still has a bug and required us to solder on a few wires! You should fix this before ordering a new PCB with these schematics!