slow cooker beef stew recipe

gredients: 2 lbs (900 g) beef stew meat, cut into 1-inch cubes 1/4 cup all-purpose flour Salt and pepper to taste 2 tablespoons olive oil 4 cups beef broth 1 cup red wine (optional) 3 carrots, peeled and sliced 3 potatoes, peeled and diced 2 celery stalks, sliced