RFR: Add gradle wrapper properties file to help IDEs

[Erik Helin]

On Fri, 28 Feb 2020 08:13:40 GMT, Robin Westberg <rwestberg at openjdk.org> wrote:

> Hi all,
> 
> Please review this change that adds a gradle-wrapper.properties file that describes the required version of Gradle.
> This will make IDEs such as IntelliJ able to open the project out of the box.
> Best regards,
> Robin

Looks good! We are gonna need a few more file to get IntelliJ to "just work", but I will fix that in a follow-up patch.

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Marked as reviewed by ehelin (Reviewer).

PR: https://git.openjdk.java.net/skara/pull/487