PR #1: Populating the repo with the old html guide files

[Jesper Wilhelmsson]

Hi.

I created a pull request in the new github repo to populate it with the old guide files so that we have a starting point. The files are unmodified except for three cases where I removed text that concerned Oracle-internal process.

The modified files are changePlanning.html, codeReview.html, and producingChangeset.html

To play by the rules I need someone who is a Reviewer to approve the PR.

https://github.com/openjdk/guide/pull/1

Thanks,
/Jesper