git: openjdk/jfx: jfx15: 8252784: Create release notes for JavaFX 15 (#296)

[duke]

Changeset: 4b757505
Author:    Johan Vos <johan at lodgon.com>
Committer: GitHub <noreply at github.com>
Date:      2020-09-07 16:30:52 +0000
URL:       https://git.openjdk.java.net/jfx/commit/4b757505

8252784: Create release notes for JavaFX 15 (#296)

* Add release notes for JavaFX 15
Fix for JDK-8252784

* add links

* add list of javascript bridge restrictions

+ doc-files/release-notes-15.md