Function createAndSignTransaction

createAndSignTransaction(connection, operations, keyStores): Promise<Buffer>
Instantiates a transaction which will contain the provided operations, as well as signs it using the provided keystores.
Parameters
- connection: Connection
  used to determine what blockchain the transaction will be submitted to
- operations: Operation[]
  what operations to include in the transaction
- keyStores: FtKeyStore[]
  the keystores which will sign the transaction
Returns Promise<Buffer>
A serialized version of the signed transaction

Remarks
Does not submit the transaction to the blockchain.