iOS simple example for TFSC public chain

According to the sdk-rpc source code provided by the TFSC official GitHub , it is implanted into the ios project. the example can be made:

• Create account
• Recover account
• Check balance
• Transfer
• Delegate
• Withdraw

The node program I mentioned is the TFSC official version that supports internal testing RPC interface. If you plan to use this demo, please make sure that the node program you are using is the latest version.