Update README.md

Author: marcojakob

README.md

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 # JavaFX UI Sandbox #
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+---
+**Note:** If you are using JavaFX 8 you may want to check out the (official) [ControlsFX](http://fxexperience.com/controlsfx/) project which contains some nice widgets!
+This is the reason why this project will not be actively developed further and will only work for JavaFX 2.
+
+---
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 Oracle has opened up the [JavaFX UI Sandbox repository](http://hg.openjdk.java.net/openjfx/sandbox-8/controls/rt) on OpenJFX as announced on the [fxExperience blog](http://fxexperience.com/2012/10/announcing-the-javafx-ui-controls-sandbox/). 
 Controls in the OpenJFX repository might eventually be included in a next JavaFX release.