Add release notes for v.0.9.0

notes/0.9.0.md

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+## ScalaFX-Extras Release v.0.9.0
+
+This release of [ScalaFX-Extras]  is mostly a bug fix release. Some small tweak to `BusyWorker` was required to resolve
+the issue with double error dialogs.
+
+### New features
+
+* Add helper method for finding parent windows for nodes [[#29]]
+
+### Bug fixes
+
+* FileSelectionField - editing text field is difficult - cursor jumps to the end after each keystroke [[#27]]
+* Error handling implemented in `SimpleTask` is disabled in `BusyWorker#_doTask` [[#28]]
+
+### Breaking Changes
+
+* `org.scalafx.extras.BusyWorker.SimpleTask` API changed to respect overrides
+  of `onSucceeded`, `onCancelled`, `onFailed` that were ignored. Issue [[#28]].
+
+To post questions, please use [Project Discussions][Discussions] or [ScalaFX Users Group][scalafx-users]
+
+[ScalaFX-Extras]: https://github.com/scalafx/scalafx-extras
+
+[Discussions]: https://github.com/scalafx/scalafx-extras/discussions
+
+[scalafx-users]: https://groups.google.com/forum/#!forum/scalafx-users
+
+
+[#27]: https://github.com/scalafx/scalafx-extras/issues/27
+
+[#28]: https://github.com/scalafx/scalafx-extras/issues/28
+
+[#29]: https://github.com/scalafx/scalafx-extras/issues/29
+