Update index.xml

[marcobehler]

Hi all, I'm currently revising my guide on database access in Java ( https://www.marcobehler.com/guides/a-guide-to-accessing-databases-in-java ) and was thinking - with the risk of it being rejected for self promotion - that including it in the 'Introduction' section would help more people get a clearer picture of the whole Java database landscape and where and how MyBatis fits in. At least that's the feedback I got so far.

In any case, thanks for considering!