Update Usage.md

Author: TonioMacaronio

Documentation/Usage.md

@@ -1,5 +1,37 @@
 # Usage
 
+---
+- **[Introduction](https://github.com/matter-labs/web3swift/blob/documentation/Documentation/Usage.md#introduction)**
+	- *[Preffered models](https://github.com/matter-labs/web3swift/blob/documentation/Documentation/Usage.md#preffered-models)*
+		- [Preffered keys Wallet Model](https://github.com/matter-labs/web3swift/blob/documentation/Documentation/Usage.md#preffered-keys-wallet-model-account)
+		- [Preffered ERC-20 Model](https://github.com/matter-labs/web3swift/blob/documentation/Documentation/Usage.md#preffered-erc-20-model)
+- **[Account Management](https://github.com/matter-labs/web3swift/blob/documentation/Documentation/Usage.md#account-management)**
+	- *[Create Account](https://github.com/matter-labs/web3swift/blob/documentation/Documentation/Usage.md#create-account)*
+		- [Create Account With Private Key](https://github.com/matter-labs/web3swift/blob/documentation/Documentation/Usage.md#create-account-with-private-key)
+		- [Create Account With Mnemonics Phrase](https://github.com/matter-labs/web3swift/blob/documentation/Documentation/Usage.md#create-account-with-mnemonics-phrase)
+	- *[Import Account](https://github.com/matter-labs/web3swift/blob/documentation/Documentation/Usage.md#create-account)*
+		- [Import Account With Private Key](https://github.com/matter-labs/web3swift/blob/documentation/Documentation/Usage.md#import-account-with-private-key)
+		- [Import Account With Mnemonics Phrase](https://github.com/matter-labs/web3swift/blob/documentation/Documentation/Usage.md#import-account-with-mnemonics-phrase)
+	- [Get Keystore Manager from wallet data](https://github.com/matter-labs/web3swift/blob/documentation/Documentation/Usage.md#get-keystore-manager-from-wallet-data)
+	- [Get wallet Private key](https://github.com/matter-labs/web3swift/blob/documentation/Documentation/Usage.md#get-wallet-private-key)
+- **[Ethereum Endpoints interaction](https://github.com/matter-labs/web3swift/blob/documentation/Documentation/Usage.md#ethereum-endpoints-interaction)**
+	- [web3 instance](https://github.com/matter-labs/web3swift/blob/documentation/Documentation/Usage.md#web3-instance)
+	- [Ethereum Address](https://github.com/matter-labs/web3swift/blob/documentation/Documentation/Usage.md#ethereum-address)
+	- *[Get Balance](https://github.com/matter-labs/web3swift/blob/documentation/Documentation/Usage.md#get-balance)*
+		- [Getting ETH balance](https://github.com/matter-labs/web3swift/blob/documentation/Documentation/Usage.md#getting-eth-balance)
+		- [Getting ERC20 token balance](https://github.com/matter-labs/web3swift/blob/documentation/Documentation/Usage.md#getting-erc20-token-balance)
+	- *[Transactions Operations](https://github.com/matter-labs/web3swift/blob/documentation/Documentation/Usage.md#transactions-operations)*
+		- [Preparing Transaction For Sending Ether](https://github.com/matter-labs/web3swift/blob/documentation/Documentation/Usage.md#preparing-transaction-for-sending-ether)
+		- [Preparing Transaction For Sending ERC-20 Tokens](https://github.com/matter-labs/web3swift/blob/documentation/Documentation/Usage.md#preparing-transaction-for-sending-erc-20-tokens)
+		- [Preparing Write Transaction for sending to some Contract and use its method](https://github.com/matter-labs/web3swift/blob/documentation/Documentation/Usage.md#preparing-write-transaction-for-sending-to-some-contract-and-use-its-method)
+		- [Preparing Read Transaction to call some Contract method](https://github.com/matter-labs/web3swift/blob/documentation/Documentation/Usage.md#preparing-read-transaction-to-call-some-contract-method)
+		- [Send write transaction](https://github.com/matter-labs/web3swift/blob/documentation/Documentation/Usage.md#writing)
+		- [Send read transaction](https://github.com/matter-labs/web3swift/blob/documentation/Documentation/Usage.md#reading)
+	- [Get Block number](https://github.com/matter-labs/web3swift/blob/documentation/Documentation/Usage.md#get-block-number)
+- **[Infura Websockets](https://github.com/matter-labs/web3swift/blob/documentation/Documentation/Usage.md#infura-websockets)**
+	- [Subscribe on new pending transactions](https://github.com/matter-labs/web3swift/blob/documentation/Documentation/Usage.md#subscribe-on-new-pending-transactions)
+	- [Get latest new pending transactions](https://github.com/matter-labs/web3swift/blob/documentation/Documentation/Usage.md#get-latest-new-pending-transactions)
+
 ## Introduction
 
 To work with platforms based on blockchain technology, in particular with Ethereum-like blockchains, developer must be fluent in concepts such as a crypto wallet, private and public key, smart contract, token and others. We will use these concepts without explaining their meanings. For more information about Ethereum, we recommend reading the book [Mastering Ethereum](https://github.com/ethereumbook/ethereumbook), by Andreas M. Antonopoulos and Gavin Wood.