Add the chicken broth, as well as lemon zest and juice. Bring the pan to a boil and cook for ~1 minute, just until the shrimp are fully cooked. Add the zoodles and parsley, and stir. Toss everything in the pan together so everything is coated with the lemon sauce, and cook just until the zoodles are warm; if they cook to long they will lose their texture. Sprinkle everything with the Parmesan and any additional parsley for garnish.