input: Write a python function to get the current temperature and wind speed for a given city using OpenWeatherMap API.
  assert get_weather('Berlin', '<your_api_key>') == {'temperature': 20.0, 'wind_speed': 5.0}  # example values
  assert get_weather('London', '<your_api_key>') == {'temperature': 15.5, 'wind_speed': 3.5}  # example values
  assert get_weather('New York', '<your_api_key>') == {'temperature': 25.3, 'wind_speed': 4.2}  # example values
output: import requests
  
  def get_weather(city, api_key):
      url = f'http://api.openweathermap.org/data/2.5/weather?q={city}&appid={api_key}&units=metric'
      response = requests.get(url)
      data = response.json()
      
      temperature = data['main']['temp']
      wind_speed = data['wind']['speed']
      
      return {'temperature': temperature, 'wind_speed': wind_speed}