[Docs] Spring Tutorial

[jseldess]

Background: https://airtable.com/tblD3oZPLJgGhCmch/viw1DKmbKhg2MIECH/recXk26BY2iuKJ6Yz

Description: We now have an improved getting started guide for using Spring.

CockroachDB will provide more support for Spring in 20.1. Currently, there is no tutorial for getting started with Spring via either Hibernate, jOOQ, or MyBatis.

Team: Andrew Woods, Rafi Shamim, Eric Harmeling

Github Tracking Issue:

[awoods187]

We should have an option to use either Hibernate, jOOQ, or Mybatis as the three supported Spring frameworks.

Relates to cockroachdb/appdev-issues#7

[awoods187]

@kai-niemi would you be willing to provide some Spring code examples for @rmloveland to document?
cc @ericharmeling and @timveil

[rmloveland]

Related:

• Add recommendations for seamless transaction retries in Java services cockroach#41135 (Issue with information about Spring retries)
• https://github.com/cockroachlabs/roachbank (Example application)