v0.0.2-alpha

In this v0.0.2-alpha version, we have implemented:

• Support ETH ABI protocol & make friendly interface for use it.
• Support generating mnemonics and generating corresponding private keys based on mnemonics.
• Implemented the EthAccount and EthWallet classes to complete the abstraction of the wallet and accounts.
• Add more example for call contract and send transaction which interact with contract.
• Make a Tetris game demo that use a contract to implement Leaderboard for score and deploy on optimism test network.
• Add more JsonRPC function support for Optimism.

FIX: fix some memory error on RLP module & bug fix.

Next phase of work:

1. Completed the encapsulation of JsonRPC (async is important support major).
2. Documentation and Newcomer Tutorials Organization.
3. Windows binary compilation.
4. Keystore opera Support.