examples: add Status encoding and decoding example

[Rjected]

Since there are currently no examples, I'm adding some to the README and the examples/ directory.

TODO:

• [ ] Add example for GetPooledTransactions
• [ ] Add example for PooledTransactions
• [ ] Add example for NewPooledTransactionHashes
• [ ] Add example for Transactions
• [ ] Add example for EthMessage
  • This should illustrate how to wrap and encode a message, as well as decode an arbitrary string into a EthMessage
• [ ] Add a few examples to the README

This should fix #13