input: Write a python function to create a header comment template for a python file.
  assert create_header("John Doe", "example.py", "An example Python script") == '''"""
  Authors: John Doe
  Filename: example.py
  Description: An example Python script
  """'''
  assert create_header("Jane Smith", "test.py", "Testing purposes") == '''"""
  Authors: Jane Smith
  Filename: test.py
  Description: Testing purposes
  """'''
  assert create_header("Alex Brown", "main.py", "Main module of the application") == '''"""
  Authors: Alex Brown
  Filename: main.py
  Description: Main module of the application
  """'''
output: def create_header(author, filename, description):
      return f'''"""
  Authors: {author}
  Filename: {filename}
  Description: {description}
  """'''