add blockchain install scripts

lib/blockchain/ethereum.js

@@ -0,0 +1,17 @@
+const coinUtils = require('../coin-utils')
+
+const common = require('./common')
+
+module.exports = {setup}
+
+const es = common.es
+
+function setup (dataDir) {
+  const coinRec = coinUtils.getCryptoCurrency('ETH')
+  common.firewall([coinRec.defaultPort])
+  setupPm2(dataDir)
+}
+
+function setupPm2 (dataDir) {
+  es(`pm2 start /usr/local/bin/geth -- --datadir "${dataDir}" --cache 500`)
+}