Add COPYRIGHT.md file listing contributors

COPYRIGHT.md

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+# Copyright Contributors to the Kokkos Project
+
+This file contains a (partial) list of people who contributed to the Kokkos-MDSpan Project
+and retain applicable copyrights to their contributions.
+
+For each contributor, we list their organization (if known) and the email
+address associated with their commits.
+
+Contributors are listed for specific date ranges reflecting major Kokkos versions.
+These lists are generated using `git shortlog -sne --since="YYYY-MM-DD" --until="YYYY-MM-DD"`
+commands.
+
+## Kokkos-MDSpan 5
+
+Date Range: present -- 2024-01-01
+
+### Sandia National Laboratories (SNL)
+
+    Under the terms of Contract DE-NA0003525 with NTESS,
+    the U.S. Government retains certain rights in this software.
+
+- Christian Trott; SNL; crtrott@sandia.gov
+- Nathan Ellingwood; SNL; ndellin@sandia.gov
+- Nicolas Morales; SNL; nmmoral@sandia.gov
+- Luc Berger-Vergiat; SNL; lberge@sandia.gov 
+- Roger Pawlowski; SNL; rppawlo@sandia.gov
+- Thomas Conrad Clevenger; SNL; tccleve@sandia.gov>
+
+### Los Alamos National Laboratory (LANL)
+
+- Damien Lebrun-Grandie; LANL; dalg24@gmail.com
+
+### Oak Ridge National Laboratory (ORNL)
+
+- Damien Lebrun-Grandie; ORNL; dalg24@gmail.com
+- Daniel Arndt; ORNL; arndtd@ornl.gov
+- Seyong Lee; ORNL; lees2@ornl.gov
+- Andrey Prokopenko <andrey.prok@gmail.com>
+
+### Commissariat à l’Energie Atomique et aux Energies Alternatives (CEA)
+
+- Thomas Padioleau; CEA; thomas.padioleau@cea.fr
+
+### NVIDIA (NVIDIA)
+
+- Mark Hoemmen; NVIDIA; mhoemmen@nvidia.com
+
+### Individual Contributors (OTHER)
+
+- Oliver Lee; OTHER; oliverzlee@gmail.com
+- Quntized; OTHER; mdsajid-09-2021911491@ne.du.ac.bd
+- Cameron Smith; OTHER; cwsmith@users.noreply.github.com
+- Larson, Eric; OTHER; numeric.larson@gmail.com
+- Namjae Choi; OTHER; Namjae.Choi@inl.gov
+- Paul Grosse-Bley; OTHER; paul.grosse-bley@ziti.uni-heidelberg.de
+- Raffaele Solcà; OTHER; rasolca@cscs.ch
+- Thomas Applencourt; OTHER; tapplencourt@anl.gov
+- Tobias Hienzsch; OTHER; post@tobias-hienzsch.de
+- Yves Delley; OTHER; delleyves@gmx.ch
+
+## Kokkos-MDSpan Contributors before 2024
+
+Date Range: entire-past -- 2024-01-01
+
+Listing only contributors with 5 or more commits
+
+### Sandia National Laboratories (SNL)
+
+    Under the terms of Contract DE-NA0003525 with NTESS,
+    the U.S. Government retains certain rights in this software.
+
+- Christian Trott; SNL; crtrott@sandia.gov
+- Nicolas Morales; SNL; nmmoral@sandia.gov
+- Daisy Hollman; SNL; dshollm@sandia.gov
+
+### Oak Ridge National Laboratories (ORNL)
+
+- Damien Lebrun-Grandie; ORNL; dalg24@gmail.com
+- Daniel Arndt; ORNL; arndtd@ornl.gov
+
+### NVIDIA (NVIDIA)
+
+- Mark Hoemmen; NVIDIA; mhoemmen@nvidia.com
+- Bryce Adelstein Lelbach; NVIDIA; brycelelbach@gmail.com
+- Yu You; NVIDIA; youyu3@gmail.com
+
+### Individual Contributors (OTHER)
+
+- Nevin Liber; OTHER; nliber@anl.gov
+