Added README.MD with disclaimer

Author: micheltakken

tutorials/buoyantSimpleFoam-aster/README.md

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+# Tutorial for an CHT simulation of a flow over a heated plate using OpenFOAM and Code_Aster
+
+This tutorial is described in the [preCICE wiki](https://github.com/precice/code_aster-adapter/wiki/Flow-over-plate-Code_Aster-Tutorial).
+
+## Disclaimer
+
+This offering is not approved or endorsed by OpenCFD Limited, producer and distributor of the OpenFOAM software via www.openfoam.com, and owner of the OPENFOAM® and OpenCFD® trademarks.
+This offering is not approved or endorsed by Électricité de France (EDF), producer and distributor of the Code_Aster software via www.code-aster.org, and owner of the Code_Aster trademark.