HHTP Protocol 

- tried to simulate a user-server application, in which the user can add, delete, or get information 
on books from a virtual library.
- new users can be registered, if the username is not taken
- a user will succesfully login if the password used corresponds to his username and the 
username exists
- the user can perform library tasks only if he has the 
- in case f error, a specific messsage will be shown
- when trying to enter library without being logged in, "Log in first" message
will be shown
- when trying to perform a library task, without the JWTtoken, "Enter library
first" message will be displayed
- when getting all books, if there are no books in the library, then
no book will be shown
- when getting a single book, if the book id does not exist, "Did not acces
book" message will be shown
- when trying to delete a book with an id nonexistent in the library, "Could 
not delete books" message will be shown
- when trying to logout without being logged in, "You are not even logged in"
message will appear

Based on stdin input, the following operations will take place:
	- "exit" -> closes the application
	- "register" -> allows the user to write a a username and password(a new account
is created if the usernaame is not already taken)
	- "login" ->  the user must write his credetntials to login to the virtual library
	- "enter_library" -> generates a JWT token for the client so that he will be able
to make changes to the library. 
	- "get_books" -> shows basic information on every book added by the user
	- "get_book" -> shows more in depth information about a book, based on its id(inputed 
by the user)
	- "add_book" -> allows the user to register a new bok to his library. (The request will
be sent only if the data is correct. e.g. the page_count must be a number)
	- "delete_book" -> based on inputted id, the user can delete a book from his library.
	- "logout " -> the user gets logged out from the server and the JWT token and Log in
cookie is deleted.

Used Parson.c library to format strings into json format, since it was 
recommended and the readme was easy to follow, so it was easy to understand
how to use the already implemented functions.