Mango Peach Shrimp Tacos

olive oil, divided 1 cup black beans 1 lb shrimp, uncooked, deveined and peeled 1/2 tsp cumin 1/4 tsp cayenne 1 cup cheddar cheese, shredded 1/4 cup fresh cilantro, chopped 1/2 cup black olives, sliced 1 lime 1/2 cup mango peach salsa