Function create_token_metadata 

pub fn create_token_metadata(
    program_id: &Pubkey,
    stake_pool: &Pubkey,
    manager: &Pubkey,
    pool_mint: &Pubkey,
    payer: &Pubkey,
    name: String,
    symbol: String,
    uri: String,
) -> Instruction

Creates an instruction to create metadata using the mpl token metadata program for the pool token