Prepare and example on how to use mnemonics

[Iysbaera]

The task is to prepare and example to cover the following topics:

1. How to import an mnemonic phrase and get a list of all public keys assossicated with that phrase.
2. Describe how to get an information on keys with non-zero balances

[RaviRanjan-11]

Implemented:

1. How to create mnemonics
2. How to create Wallet with Mnemonics Phrase
3. How to get a Private key for Created Wallet address

https://github.com/skywinder/web3swift/blob/develop/HelperMethodsForApp/CreateWalletWrapper.swift

[RaviRanjan-11]

This Repo contain

Implement of How to Import Wallet
1. With Mnemonics Phrase
2. With Private Key

MyWeb3Wallet

Also Implemented here

1. How to create mnemonics
2. How to create Wallet with Mnemonics Phrase
3. How to get a Private key for Created Wallet address