readme.mkd: add clipboard library's original url
readme.mkd: add clipboard library's original url

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