Added license file.

LICENSE.md

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+
+This is DiSk++, a template library for DIscontinuous SKeletal methods.
+
+DiSk++ was started by Matteo Cicuttin on 2016 and is currently developed
+and (C) by the following people (in alphabetical order)
+
+    Karol Cascavita
+    Matteo Cicuttin
+    Nicolas Pignet
+
+This Source Code Form is subject to the terms of the Mozilla Public
+License, v. 2.0. If a copy of the MPL was not distributed with this
+file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+If you use this code or parts of it for scientific publications, you
+are required to cite it as following:
+
+Implementation of Discontinuous Skeletal methods on arbitrary-dimensional,
+polytopal meshes using generic programming.
+M. Cicuttin, D. A. Di Pietro, A. Ern.
+Journal of Computational and Applied Mathematics.
+DOI: 10.1016/j.cam.2017.09.017