Add License files

LICENSE.md

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+# GRAY User Agreement (2022.11.17)
+
+Copyright (c) 2007-2022, ISTP-CNR
+
+This software was developed by the Institute for Plasma Science and
+Technology (ISTP), formerly Institute for Plasma Physics (IFP), National
+Research Council of Italy (CNR) and its development was partly funded by
+Euratom (under EFDA and EUROfusion consortium agreements). Its
+distribution is subject to requirements and restrictions imposed by CNR
+and Euratom.
+
+In order to acquire access to the code sources, the recipient agrees:
+
+1. To use the software exclusively for non-commercial research purposes.
+2. Not to use the software for military purposes or any other purpose
+falling under the provisions for non-proliferation.
+3. To receive the software "as is", without any warranty that the
+software is in good running order and that its use will not involve any
+infringement of copyright; no liability can be accepted for damage or
+injury arising from use of the software.
+4. To include in published results or presentations the proper code
+name(s) and appropriate references.
+5. If the copy of the software downloaded by the authorized user is made
+available to third parties, to ensure that the user agreement is
+distributed to and followed by the third parties.
+
+---
+
++ (3-bis) To notify <grayua@istp.cnr.it> if they discover that the
+software contains any error or infringes any copyright.
++ (3-ter) To use the software without modification; users however are
+welcome to request changes, or to contribute modifications subject to
+approval of the authors.
++ (4-pre) To send a one-time email to <grayua@istp.cnr.it> describing
+planned research using that module.
++ (4-bis) Prior to publication, to email a draft of the manuscript to
+<grayua@istp.cnr.it>.
+
+## Third-parties contributions acknowledgement
+
+The solver for the plasma response function with parallel momentum
+conservation for Current Drive calculation makes use of routines
+developed by N.B. Marushchenko, Max Planck Institute of Plasma Physics,
+Greifswald, Germany. This should be properly acknowledged, in case such
+model is used:
+
+N. B. Marushchenko, C. D. Beidler, and H. Maassberg, *Fusion Sci.
+Technol.* **55** (2009) 180.
+
+This software includes adaptations of software developed by the
+University of Chicago, as Operator of Argonne National Laboratory, and
+other public domain library routines obtained from the
+[Netlib](https://netlib.org/) repository:
+
+- [`dierckx`](https://netlib.org/dierckx/)
+- [`minpack`](https://netlib.org/minpack/)
+- [`quadpack`](https://netlib.org/quadpack/)
+- [`slatec`](https://netlib.org/slatec/)
+
+The full license notice for the `minpack` library can be found in the
+[documentation](./minpack-LICENSE.txt).

minpack-LICENSE.txt

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+Minpack Copyright Notice (1999) University of Chicago.  All rights reserved
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice,
+this list of conditions and the following disclaimer in the documentation
+and/or other materials provided with the distribution.
+
+3. The end-user documentation included with the redistribution, if any, must
+include the following acknowledgment:
+
+    "This product includes software developed by the University of Chicago,
+    as Operator of Argonne National Laboratory."
+
+Alternately, this acknowledgment may appear in the software itself, if and
+wherever such third-party acknowledgments normally appear.
+
+4. WARRANTY DISCLAIMER. THE SOFTWARE IS SUPPLIED "AS IS" WITHOUT WARRANTY OF
+ANY KIND. THE COPYRIGHT HOLDER, THE UNITED STATES, THE UNITED STATES
+DEPARTMENT OF ENERGY, AND THEIR EMPLOYEES: (1) DISCLAIM ANY WARRANTIES,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE OR
+NON-INFRINGEMENT, (2) DO NOT ASSUME ANY LEGAL LIABILITY OR RESPONSIBILITY
+FOR THE ACCURACY, COMPLETENESS, OR USEFULNESS OF THE SOFTWARE, (3) DO NOT
+REPRESENT THAT USE OF THE SOFTWARE WOULD NOT INFRINGE PRIVATELY OWNED
+RIGHTS, (4) DO NOT WARRANT THAT THE SOFTWARE WILL FUNCTION UNINTERRUPTED,
+THAT IT IS ERROR-FREE OR THAT ANY ERRORS WILL BE CORRECTED.
+
+5. LIMITATION OF LIABILITY. IN NO EVENT WILL THE COPYRIGHT HOLDER, THE
+UNITED STATES, THE UNITED STATES DEPARTMENT OF ENERGY, OR THEIR EMPLOYEES:
+BE LIABLE FOR ANY INDIRECT, INCIDENTAL, CONSEQUENTIAL, SPECIAL OR PUNITIVE
+DAMAGES OF ANY KIND OR NATURE, INCLUDING BUT NOT LIMITED TO LOSS OF PROFITS
+OR LOSS OF DATA, FOR ANY REASON WHATSOEVER, WHETHER SUCH LIABILITY IS
+ASSERTED ON THE BASIS OF CONTRACT, TORT (INCLUDING NEGLIGENCE OR STRICT
+LIABILITY), OR OTHERWISE, EVEN IF ANY OF SAID PARTIES HAS BEEN WARNED OF THE
+POSSIBILITY OF SUCH LOSS OR DAMAGES.