Swiss Chard with Shallots

Ingredients: 1 tablespoon olive oil 1 shallot, finely chopped 1/8 teaspoon red pepper flakes 2 bunches Red or White Swiss chard, rinsed well (I prefer the red, it is sweeter) 2 tablespoons apple cider vinegar or balsamic vinegar (I prefer the balsamic) 1/2 teaspoon...