Add prerequisites to readme.
Add prerequisites to readme.

zcoinrocks/bitcore-node,kleetus/bitcore-node,zcoinrocks/bitcore-node,snogcel/bitcore-node-dash,snogcel/bitcore-node-dash,phplaboratory/psiacore-node,phplaboratory/psiacore-node,phplaboratory/psiacore-node,braydonf/bitcore-node,phplaboratory/psiacore-node,kleetus/bitcore-node,phplaboratory/psiacore-node,braydonf/bitcore-node