input: Write a python function to generate a random matrix with given dimensions using NumPy.
  assert generateRandomMatrix(2, 3).shape == (2, 3)
  assert generateRandomMatrix(5, 5).shape == (5, 5)
  assert generateRandomMatrix(1, 10).shape == (1, 10)
output: import numpy as np
  
  def generateRandomMatrix(rows, cols):
      return np.random.rand(rows, cols)