Add books to series

[Randy]

Currently, Ben Stevens has one book shown in the "Ennin" series:

https://www.goodreads.com/series/1490...

However, there are nearly 100 books in the series:

https://www.goodreads.com/search?q=en...

Amazon currently shows 96 books:

https://www.amazon.com/gp/search?node...

[Renske]

I added the books I could easily find to the series.

[Randy]

Thanks. That wasn't a small task. :(