Add sidecar documentation for java apps
Add sidecar documentation for java apps

[#166915511](https://www.pivotaltracker.com/story/show/166915511)

Co-authored-by: Sannidhi Jalukar <0664d5eb2b0d1f1e7a82b34b71de24e193a1c487@pivotal.io>
Co-authored-by: Chris Selzo <bcc9b34dc8d1772f303d51b58a7185cdba80a88e@pivotal.io>

cloudfoundry/docs-dev-guide