reimplement blockchain_go in rust, and not only blockchain_go;

a simple blockchain demo for learning

1. part1: Basic Prototype 基本原型 commit bd0efe7
2. part2: Proof-of-Work 工作量证明 commit 9d9370a
3. part3: Persistence and CLI 持久化、命令行、日志 commit e2094c0
4. part4: Transactions 1 交易（1） commit bdbdcec
5. part5: Addresses 地址和签名 commit 440cba2
6. part6: Transactions 2 交易（2） commit 4912743
7. part7: Network 网络和分布式一致性算法 master

• 基本原型和工作量证明算法: part1.md

• Create wallet:

  cargo run createwallet

• Create blockchain:

  cargo run createblockchain <address>
  

• send coins (if -m is specified, the block will be mined immediately in the same node):

  cargo run send <from> <to> <amount> -m 
  

• start server:

  cargo run startnode <port>
  

  or start miner node:

  cargo run startminer <port> <address>
  

• get balance:

  cargo run getbalance <address>
  

You can use the RUST_LOG=info to print the log.

• blockchain_go code: https://github.com/Jeiwan/blockchain_go
• Build a cryptocurrency! - Blockchain in Rust: https://github.com/GeekLaunch/blockchain-rust
• 中文版文档：https://liuchengxu.gitbook.io/blockchain/