link to license added

README.md

@@ -11,3 +11,5 @@ Oberon → ARMv{6,7E}-M compiler, based on N. Wirth [Project Oberon](http://
 [Some notes](https://wiki.oberon.org/ob/o7) (in Russian)
 
 Alexander V. Shiryaev, 2023
+
+[License](O7/Docu/license.txt)