Added license

LICENSE

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+Attribution-ShareAlike 3.0 Unported
+http://creativecommons.org/licenses/by-sa/3.0/deed.en_GB
+
+
+You are free:
+to copy, distribute, display, and perform the work
+to make derivative works
+to make commercial use of the work
+
+
+Under the following conditions:
+Attribution — You must give the original author credit.
+Share Alike — If you alter, transform, or build upon this work, you may distribute the resulting work only under a licence identical to this one.
+
+
+With the understanding that:
+Waiver — Any of the above conditions can be waived if you get permission from the copyright holder.
+
+Public Domain — Where the work or any of its elements is in the public domain under applicable law, that status is in no way affected by the licence.
+
+Other Rights — In no way are any of the following rights affected by the licence:
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+Your fair dealing or fair use rights, or other applicable copyright exceptions and limitations;
+
+The author's moral rights;
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+Rights other persons may have either in the work itself or in how the work is used, such as publicity or privacy rights.
+
+Notice — For any reuse or distribution, you must make clear to others the licence terms of this work.