Update README.md

README.md

@@ -6,6 +6,9 @@ class.
 For an overview about the CurvedGrid and the CurvedGeometry, see also the presentation
 [Dune-CurvedGrid - A Dune module for surface parametrization](http://wwwpub.zih.tu-dresden.de/~praetori/presentations/dune-curvedgrid).
 
+## Mirror
+This repositories is mirrored to https://gitlab.com/iwr/dune-curvedgrid.
+
 ## Installation Instructions
 `dune-curvedgrid` requires the DUNE core modules, version 2.7 or later.
 Please see the [general instructions for building DUNE modules](https://www.dune-project.org/doc/installation)