added list of payment engines for catarse project
added list of payment engines for catarse project

included links to 3 payment engines

catarse/catarse,catarse/catarse,sushant12/jvn,catarse/catarse,sushant12/jvn,paulopatto/catarse,sushant12/jvn,catarse/catarse,sushant12/jvn,danielweinmann/catarse,danielweinmann/catarse,paulopatto/catarse,paulopatto/catarse,paulopatto/catarse