Add docs for Mapping
Add docs for Mapping

rom-rb/rom,jeremyf/rom,endash/rom,cored/rom,kwando/rom,pxlpnk/rom,vrish88/rom,rom-rb/rom,rom-rb/rom,dekz/rom,pdswan/rom,Snuff/rom,pvcarrera/rom,dcarral/rom,denyago/rom