Function create_mint 

pub fn create_mint(
    program_id: &Pubkey,
    wrapped_mint_address: &Pubkey,
    wrapped_backpointer_address: &Pubkey,
    unwrapped_mint_address: &Pubkey,
    wrapped_token_program_id: &Pubkey,
    idempotent: bool,
) -> Instruction

Creates CreateMint instruction.