Add instruction to add new node

After seeing the blank interface, people need to know how to add nodes. Newbies often get confused and regard this repository as self sufficient, its dependence on eth-net-intelligence-api should be made more prominent.

README.md

@@ -4,6 +4,7 @@ Ethereum Network Stats based off github.com/cubedro/eth-netstats
 
 This is a visual interface for tracking ethereum network status. It uses WebSockets to receive stats from running nodes and output them through an angular interface. It is the front-end implementation for [eth-net-intelligence-api](https://github.com/eosclab/eth-net-intelligence-api).
 
+
 ![Screenshot](https://raw.githubusercontent.com/eosclab/eth-netstats/master/src/images/screenshot.jpg?v=0.0.6 "Screenshot")
 
 ## Prerequisite
@@ -36,6 +37,10 @@ npm start
 
 see the interface at http://localhost:3000
 
+## Add nodes to site
+
+For now, the site should be looking blank. For instruction on adding new nodes to the site, refer to [eth-net-intelligence-api](https://github.com/eosclab/eth-net-intelligence-api).
+
 ## Updates since original cubedro/eth-netstats base:
 
 + Fixed block history if chain is shorted than MAX_HISTORY