RFR: 6855: Should add information about where to get builds to README [v3]

[Guru Hb]

On Wed, 15 Jul 2020 13:43:03 GMT, Marcus Hirt <hirt at openjdk.org> wrote:

>> Adding binary download info and cleaning up a bit
>
> Marcus Hirt has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Removing Oracle downloadable update site archive

Marked as reviewed by ghb (Reviewer).

-------------

PR: https://git.openjdk.java.net/jmc/pull/91