Add LICENSE

LICENSE

+**************************************************************************
+ amatos
+ Adaptive Mesh Generator for Atmosphere and Ocean Simulation
+ Version 2.0
+ (7/2003)
+**************************************************************************
+
+LICENSE
+
+The use of amatos is hereby granted free of charge for an unlimited time,
+provided the following rules are accepted and applied:
+
+1. You may use or modify this code for your own non commercial and non 
+   violent purposes.
+2. The code may not be re-distributed without the consent of the authors.
+3. The copyright notice and statement of authorship must appear in all
+   copies.
+4. You accept the warranty conditions (see file WARRANTY).
+5. In case you intend to use the code commercially, we oblige you
+   to sign an according licence agreement with the authors.
+
+**************************************************************************
+ J. Behrens, 07/2003
+**************************************************************************