add DCO and update copyright

Signed-off-by: Niklas Eiling <niklas.eiling@eonerc.rwth-aachen.de>

DCO.md

+Developer Certificate of Origin
+Version 1.1
+
+Copyright (C) 2004, 2006 The Linux Foundation and its contributors.
+
+Everyone is permitted to copy and distribute verbatim copies of this
+license document, but changing it is not allowed.
+
+
+Developer's Certificate of Origin 1.1
+
+By making a contribution to this project, I certify that:
+
+(a) The contribution was created in whole or in part by me and I
+    have the right to submit it under the open source license
+    indicated in the file; or
+
+(b) The contribution is based upon previous work that, to the best
+    of my knowledge, is covered under an appropriate open source
+    license and I have the right under that license to submit that
+    work with modifications, whether created in whole or in part
+    by me, under the same open source license (unless I am
+    permitted to submit under a different license), as indicated
+    in the file; or
+
+(c) The contribution was provided directly to me by some other
+    person who certified (a), (b) or (c) and I have not modified
+    it.
+
+(d) I understand and agree that this project and the contribution
+    are public and that a record of the contribution (including all
+    personal information I submit with it, including my sign-off) is
+    maintained indefinitely and may be redistributed consistent with
+    this project or the open source license(s) involved.
+

LICENSE

 MIT License
 
-Copyright (c) 2018-2020 Niklas Eiling
+Copyright (c) 2018-2023 Niklas Eiling
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

README.md

@@ -77,6 +77,8 @@ REMOTE_GPU_ADDRESS=remoteSystem.my-domain.com LD_PRELOAD=/nfs_share/cricket/bin/
 * **tests:** some synthetic CUDA applications to test cricket.
 * **utils:** A Dockerfile for repoducibility and for our CI.
 
+Please agree to the [DCO](DCO.md) by signing off your commits.
+
 ## Style Guidelines:
 ```
 set cindent