Feat/opening day python solution -> main

[alangnt]

Hi Codédex team,

This PR adds a working Python solution for today's Opening Day ⚾ challenge, and updates the README.md file to add today's GitHub link.

Here's the code :

def streak_counter(games):
  best_streak = 0
  current_streak = 0

  # for each game
  for game in games:
    # if it's a win
    if game == "W":
      # add 1 to current streak and return highest value
      # between best and current
      current_streak += 1
      best_streak = max(best_streak, current_streak)
    elif game == "L":
      # else if lose current streak goes to 0
      current_streak = 0

  return best_streak

Here's how it works :

• init two variables best_streak and current_streak at 0
• for each game if win we add 1 to the current streak and return the highest value between best and current into best_streak to only keep the best streak of all time
• if lose, we reset the current streak to 0
• if rainout we don't do anything because it does not modify the streak
• finally we return the best streak