Zesty Lime Shrimp and Avocado Salad

Ingredients
¼ cup chopped red onion
Juice of 2 limes
1 teaspoon olive oil
¼ teaspoon kosher salt
Black pepper to taste
1 pound jumbo cooked shrimp, peeled and chopped
1 medium tomato, diced
1 medium Hass avocado, diced (about 5 oz)
1 jalapeño, seeds removed, finely diced
1 tablespoon chopped cilantro