note on licenses

Author: filikat

LicenseNote.txt

@@ -0,0 +1,12 @@
+The HiGHS source code in highs/ is available under MIT 
+license (see LICENSE.TXT).
+
+Some of the code in extern/ is available under other 
+similar permissive licenses:
+ - SuiteSparse AMD is available under BSD 3-clause license.
+ - Metis is available under Apache 2.0 license.
+
+These codes ara needed only when building HiGHS with HiPO 
+support (-DHIPO=ON). If this is the case, then the resulting 
+HiGHS library and executables are available with Apache 2.0 
+license rather than MIT.