add `Lmoments` method to calculate the `Weibul` distribution parameter

[MAfarrag]

Is your feature request related to a problem? Please describe.

• the below function calculates parameter of the Weibul distribution based on the lmoments.

def weibull(lmoments):
    if len(lmoments) < 3:
        print("Insufficient L-Moments: Need 3")
        return
    if lmoments[1] <= 0 or lmoments[2] >= 1 or lmoments[2] <= -lmoments.lmrgum([0, 1], 3)[2]:
        print(LMOMENTS_INVALID_ERROR)
        return
    pg = Lmoments.GEV([-lmoments[0], lmoments[1], -lmoments[2]])
    delta = 1 / pg[2]
    beta = pg[1] / pg[2]
    out = [-pg[0] - beta, beta, delta]
    return (out)

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