Add THANKS file

THANKS

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+The following persons have contributed to the development of the simage
+library family through patches, bug reports, bugfixes, ideas for
+improvements, etc:
+
+Lars J. Aas
+Peder Blekken
+Tom Fredrik Blenning Klaussen
+Jack Boos Yu
+Volker Enderlein
+Morten Eriksen
+Tamer Fahmy
+Giampiero Gabbiani
+Raphael Grimm
+Thomas Hammer
+�ystein Handegard
+Frode Ingebrigtsen
+Marius Kintel
+Mario Koerner
+Karin (kyrah) Kosina
+Lorenz Lechner
+Lars Moastuen
+Leopold Palomo-Avellaneda
+Markus Rickert
+Miroslav �ulc
+Sveinung Thunes
+Jostein Topland
+Bastiaan Veelo
+Bernd Waibel
+yopito