Added missing Makefile
Added missing Makefile

fredericgermain/libcoap,markushx/libcoap,nmacs/libcoap,alexaring/libcoap,joaopedrotaveira/libcoap,markushx/libcoap,nmacs/libcoap,sgso/libcoap,OlegHahm/libcoap,OlegHahm/libcoap,fredericgermain/libcoap,pabigot/libcoap,PolymorhicCode/libcoap,thecodemaiden/libcoap-fork,joaopedrotaveira/libcoap,OlegHahm/libcoap,sgso/libcoap,thecodemaiden/libcoap-fork,joaopedrotaveira/libcoap,authmillenon/libcoap,sgso/libcoap,markushx/libcoap,gebart/libcoap,pabigot/libcoap,authmillenon/libcoap,RIOT-OS/libcoap,RIOT-OS/libcoap,gebart/libcoap,pabigot/libcoap,nmacs/libcoap,alexaring/libcoap,gebart/libcoap,alexaring/libcoap,authmillenon/libcoap,fredericgermain/libcoap