Added function that returns list of tv shows on a given day

I was reading up on the code and trying to understand it. I added a feature which allows users of the API to get the list of shows on a given day. In the website, we only get the list of shows of current day and the day before and the day after the current day. If you think this is a useful feature, you can merge it. My code may not be the most optimal, so if you have suggestions, do let me know so i can improve it.