make.cmd: add: `make help`
make.cmd: add: `make help`

tyochiai/nyagos,hattya/nyagos,kissthink/nyagos,hattya/nyagos,kissthink/nyagos,kissthink/nyagos,hattya/nyagos,nocd5/nyagos,zetamatta/nyagos,tsuyoshicho/nyagos