Heat 1 teaspoon olive oil in a medium skillet over medium-high. Add shrimp; cook 2 minutes on each side or until done. Remove from pan; keep warm. Return skillet to medium-high. Add remaining 1 teaspoon oil to pan; swirl to coat. Add onion and garlic; sauté 4 minutes or until onion is tender. Add squash, tomatoes, juice, rosemary, and salt. Cook 2 minutes or until warmed through. Top with shrimp.