Here you will find information on Quidditch Through the Ages.
Quidditch Through the Ages is both a fictional book described in the Harry Potter series of novels by J. K. Rowling, and a real book by that author, although her name is only stated in the book as the copyright holder of the “Harry Potter”-name. The real book purports to be a reproduction of a copy of the fictional book held in the Hogwarts library, written by Kennilworthy Whisp. (source)
The book was written by Jo to help raise funds for Comic Relief. The book includes scribblings in it by Harry Potter and Ron Weasley (though the scribblings are really in Jo’s handwriting).