Added cursor icons for the whiteboard tools

bigbluebutton-html5/public/resources/images/whiteboard-cursor/icons-license.txt

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+Silk icon set 1.3
+
+_________________________________________
+Mark James
+http://www.famfamfam.com/lab/icons/silk/
+_________________________________________
+
+This work is licensed under a
+Creative Commons Attribution 2.5 License.
+[ http://creativecommons.org/licenses/by/2.5/ ]
+
+This means you may use it for any purpose,
+and make any changes you like.
+All I ask is that you include a link back
+to this page in your credits.
+
+Are you using this icon set? Send me an email
+(including a link or picture if available) to
+mjames@gmail.com
+
+Any other questions about this icon set please
+contact mjames@gmail.com
+
+==================================================
+Diagona Icons
+
+Copyright (C) 2007 Yusuke Kamiyamane. All rights reserved.
+The icons are licensed under a Creative Commons Attribution
+3.0 license. <http://creativecommons.org/licenses/by/3.0/>
+
+If you can't or don't want to provide a link back, please
+purchase a royalty-free license.
+<http://p.yusukekamiyamane.com/>
+
+I'm unavailable for custom icon design work. But your
+suggestions are always welcome!
+<mailto:p@yusukekamiyamane.com>
+====================