jellyfish-wallet the hdw for DeFi Blockchain (#135)

* jellyfish-wallet project init

* added wallet_hd_node.ts and wallet_account.ts

* completed jellyfish-wallet

* init jellyfish-wallet-mnemonic

* completed jellyfish-wallet-mnemonic

* init jellyfish-wallet-ocean

* added tests for jellyfish-wallet-mnemonic

* added wallet_hd_node tests

* removed Promise from provider since now all operations is lite

* added wallet_account.test.ts

* completed wallet.test.ts

* added todo for ocean wallet account

* updated docs

packages/jellyfish-wallet-mnemonic/README.md

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+[![npm](https://img.shields.io/npm/v/@defichain/jellyfish-wallet-mnemonic)](https://www.npmjs.com/package/@defichain/jellyfish-wallet-mnemonic/v/latest)
+[![npm@next](https://img.shields.io/npm/v/@defichain/jellyfish-wallet-mnemonic/next)](https://www.npmjs.com/package/@defichain/jellyfish-wallet-mnemonic/v/next)
+
+# @defichain/jellyfish-wallet-mnemonic
+
+MnemonicHdNode implements the WalletHdNode from jellyfish-wallet; a CoinType-agnostic HD Wallet for noncustodial DeFi.
+
+Purpose [44'] / CoinType-agnostic [n] / Account [n] / Chain (ignored for now) [0] / Addresses [n]
+
+- BIP32 Hierarchical Deterministic Wallets
+- BIP39 Mnemonic code for generating deterministic keys
+- BIP44 Multi-Account Hierarchy for Deterministic Wallets