Add Of Mice and Men to Fiction

[pahnev]

In this pull request

• [x] I am adding a new book.
• [ ] I am adding a new category
• [ ] Removing a book

Adding new book

• The book I am adding is Of Mice and Men by John Steinbeck
• I am adding this book to Fiction-Classics section.
• I have read this book 1 times.
• I think this book deserves to be in this list because it's well written with a fairly high ratings.