Add some info about API

Author: akondas

README.md

@@ -16,6 +16,39 @@ Clean code approach to blockchain technology. Learn blockchain by reading source
  - [ ] Going serverless with AWS Lambda (experiment)
  - [ ] Start working on KondasCoin [akondas/coin](https://github.com/akondas/coin) :rocket: (Transactions, Wallet, Transaction relaying, Maybe some UI)
 
+## Node
+
+To start the node:
+
+```
+bin/node
+```
+
+Default port is 8080 but you can change it with `--port` param:
+
+```
+bin/node --port=9090
+```
+
+## API
+
+To control node you can use simple (pseudo) REST API:
+
+```
+GET /blocks
+
+Return list of blocks:
+[{"index":0,"hash":"8b31c9ec8c2df21968aca3edd2bda8fc77ed45b0b3bc8bc39fa27d5c795bc829","previousHash":"","createdAt":"2018-02-23 23:59:59","data":"PHP is awesome!","difficulty":0,"nonce":0}]
+```
+
+```
+POST /mine 
+"post content is data to mine"
+
+Return mined block:
+{"index":1,"hash":"a6eba6325a677802536337dc83268e524ffae5dc7db0950c98ff970846118f80","previousHash":"8b31c9ec8c2df21968aca3edd2bda8fc77ed45b0b3bc8bc39fa27d5c795bc829","createdAt":"2018-03-13 22:37:07","data":"Something goof","difficulty":0,"nonce":0}
+```
+
 ## Tests
 
 To run test suite: