create: TxDescriptor<{
    cap: bigint;
    end: number;
    first_period: number;
    index: number;
    last_period: number;
    verifier: MultiSigner | undefined;
}>

Create a new crowdloaning campaign for a parachain slot with the given lease period range.

This applies a lock to your parachain configuration, ensuring that it cannot be changed by the parachain manager.