add badges to readme

Author: RCasatta

Readme.md

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+[![MIT license](https://img.shields.io/github/license/RCasatta/bitcoind)](https://github.com/RCasatta/bitcoind/blob/master/LICENSE)
+[![Crates](https://img.shields.io/crates/v/bitcoind.svg)](https://crates.io/crates/bitcoind)
+
 # Bitcoind
 
 Utility to run a regtest bitcoind process, useful in integration testing environment.