Java client information.

[hayleycd]

Summary

Partially addresses #324 by adding Java client information.

Release Note

None

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[hayleycd]

@loosebazooka tagging you in case you want to review. CC: @haydentherapper @cmurphy

[loosebazooka]

I'm not sure how I feel about the duplication of information... These tend to go out of date as the source of truth would be sigstore-java? Should this just be an automated pull in of the readme on sigstore-java (or some translation of it)? Alternatively we could include this is a point to update in our release plan, but that does put more work on the devs.

[hayleycd]

@loosebazooka that makes a lot of sense. @haydentherapper @cmurphy and I are trying to thread a needle a little bit--a little bit of repetition, but increased exposure, and the devs get to primarily work within their own repositories and aren't forced to standardize between the different language clients. We have open PRs for the other language clients too.