input: Write a python function to simulate a Rock-Paper-Scissors game where player 1's choice is given as an argument and player 2's choice is randomly selected.
  assert rock_paper_scissors('Rock') in ['Player 1 wins', 'Player 2 wins', 'Its a tie!']
  assert rock_paper_scissors('Paper') in ['Player 1 wins', 'Player 2 wins', 'Its a tie!']
  assert rock_paper_scissors('Scissor') in ['Player 1 wins', 'Player 2 wins', 'Its a tie!']
output: import random
  
  def rock_paper_scissors(player1_choice):
      choices = ['Rock', 'Paper', 'Scissor']
      player2_choice = random.choice(choices)
      
      if player1_choice == player2_choice:
          return "Its a tie!"
      
      if (player1_choice == 'Rock' and player2_choice == 'Scissor') or \
         (player1_choice == 'Paper' and player2_choice == 'Rock') or \
         (player1_choice == 'Scissor' and player2_choice == 'Paper'):
          return "Player 1 wins"
      else:
          return "Player 2 wins"