added CONTRIBUTING.md

Martin Plieske · Martin Plieske · commit ae104389825c · 2019-12-09T10:43:16.000+01:00
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
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+If you want to contribute, use the "JavaFX Scene Builder 8.5.0" for fxml files.

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	`1`	`+If you want to contribute, use the "JavaFX Scene Builder 8.5.0" for fxml files.`