Add CRUD function for Book related activites.

[JustinW1395]

[JustinW1395]

Added some simple boiler plate code for CRUD function of books stuff for the API. Still working on learning the multi-table design with DynamoDB and how to make the tables talk to each other. Here is the link to the commit of the code done so far for the books function: https://github.com/MobileApps-Cascadia/texttrader-data/commit/ce79758067c68740f156df8eed940217bf21e5d1

[JustinW1395]

Some code is being done within API Gateway and I will make a file to explain the steps for each of the items and add it to the repo upon completion.

[JustinW1395]

Still trying to get some authentication for the posting of a book listing. May have some additions for the code base by the end of the weekend.