Permissions have been added!

Three permissions come by default, and apply to all books/chapters namely

1. library.read: Needed to use the /read command
2. library.read.books: Needed to use the /read <bookname>
3. library.read.books.chapter: Needed to use the /read <bookname> <chapter> and get book

Then there are permissions that are created upon making a book. It will be in the format library.<bookname> to be able to read the description of the book and get all chapters of the book. Then there is the permission library.<bookname>.<chapter> which allows the user to only read that chapter from the book.