add LICENSE.txt for icons folder
diff --git a/org.eclipse.osbp.xtext.chart.ui/icons/LICENSE.txt b/org.eclipse.osbp.xtext.chart.ui/icons/LICENSE.txt
new file mode 100644
index 0000000..0b4722c
--- /dev/null
+++ b/org.eclipse.osbp.xtext.chart.ui/icons/LICENSE.txt
@@ -0,0 +1,27 @@
+/**
+ *
+ * Copyright (c) 2011, 2016 - Loetz GmbH&Co.KG (69115 Heidelberg, Germany)
+ *
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ * Christophe Loetz (Loetz GmbH&Co.KG) - initial implementation
+ */
+
+The following files are part of the Eclipse OSBP project and can be used under the same license:
+------------------------------------------------------------------------------------------------
+
+chart_axis.png
+chart_interval.png
+chart_legend.png
+chart_tooltip.png
+dsl_chart.png
+dsl_datamart.png
+dsl_import.png
+dsl_option.png
+dsl_range.png
+model.png
+package.gif
