Feat/my best streak python solution -> main

[alangnt]

Hi Codédex team,

This PR creates a folder for today's My Best Streak 🔥 challenge, adds a working Python solution, and updates the README.md file to add today's GitHub link.

Here's the code :

def longest_streak(progress):
  # define best and current streaks
  best_streak = 0
  current_streak = 0

  # for each day
  for day in progress:
    # if completed, add 1 to current
    if day == "✅":
      current_streak += 1
      # if current higher than best
      # replace best by current
      if current_streak > best_streak:
        best_streak = current_streak
    # else reset current
    else:
      current_streak = 0

  return best_streak

Here's how it works :

• we go through the list day by day
• if it's a ✅ we increment the current streak counter, and update the best if it's now higher
• if it's a ❌ we just reset the current counter to 0
• at the end we return the best streak we found