updated readme

README

 This is the Go implementation of the Ethereum protocol. It's far from being finished.
 
-    go get https://github.com/ethereum/go-ethereum
+```go get https://github.com/ethereum/go-ethereum```
 
-The Python reference implementation can be found at https://github.com/ethereum/pyethereum
+** The Python reference implementation can be found at https://github.com/ethereum/pyethereum **
 
-More information about the protocol:
-* http://vitalik.ca/ethereum.html
-* http://vitalik.ca/ethereum/spec.html
-* http://vitalik.ca/ethereum/patricia.html
-* http://vitalik.ca/ethereum/dagger.html
-* http://vitalik.ca/ethereum/rlp.html
+## Command line options
 
-# TODO
+-db will launch the db query tool.
 
-Fix this todo file!
+Supported arguments `update` and `get`