Add license notes

README.md

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-Darcula IDE Theme
+Darcula Theme
 =================
 
 The official Darcula Look and Feel for programming environments by Konstantin Bulenkov.
 
+Darcula is a Look-n-Feel for Java desktop application and a theme for code editors. This repository focused mainly on Java look-n-feel and contains ready to use library here https://github.com/bulenkov/Darcula/blob/master/build/darcula.jar
+
+Darcula Look-n-Feel is licensed under Apache 2.0 license and can be used in commercial products free of charge. However, I strongly ask you to use original theme name "Darcula" in your product. Links to this project from your products or a simple mention are very welcome, but not necessary. 
+
+List of projects with Darcula theme:
+1. JetBrains IDEs: IntelliJ IDEA, PyCharm, PhpStorm, WebStorm, AppCode, DataGrip, RubyMine, Gogland, Rider, CLion
+2. NetBeans
+3. jAlbum
+4. Please send me your project to add here
+
+
 Resources about how to create your own look and feel can be found at Oracle's official website:
 http://docs.oracle.com/javase/tutorial/uiswing/index.html