Update README.md

README.md

@@ -2,3 +2,13 @@ SWE
 ===
 
 The Shallow Water Equations teaching code.
+
+Documentation
+-------------
+
+The documentation is available in the [Wiki](https://github.com/TUM-I5/SWE/wiki)
+
+License
+-------
+
+SWE is release unter GPLv3 (see [gpl.txt](gpl.txt))