Add DCO and update CONTRIBUTING.md (#82105)

.github/CONTRIBUTING.md

@@ -10,9 +10,11 @@ The GitHub issue tracker is not the best place for questions for various reasons
 
 ## CONTRIBUTING ?
 
-By contributing you agree that these contributions are your own (or approved by your employer) and you grant a full, complete, irrevocable copyright license to all users and developers of the project, present and future, pursuant to the license of the project. You can also read the same [CLA](https://docs.ansible.com/ansible/latest/community/contributor_license_agreement.html) on the Ansible docsite.
+By contributing to this project you agree to the [Developer Certificate of Origin (DCO)](#developer-certificate-of-origin-dco).
 
-Please review the [Community Guide](https://docs.ansible.com/ansible/latest/community/index.html) for more information on contributing to Ansible.
+The Ansible project is licensed under the [GPL-3.0](COPYING) or later. Some portions of the code fall under other licenses as noted in individual files.
+
+The Ansible project accepts contributions through GitHub pull requests. Please review the [Community Guide](https://docs.ansible.com/ansible/latest/community/index.html) for more information on contributing to Ansible.
 
 ## BUG TO REPORT ?
 
@@ -23,3 +25,46 @@ You can report bugs or make enhancement requests at the [Ansible GitHub issue pa
 Also please make sure you are testing on the latest released version of Ansible or the development branch; see the [Installation Guide](https://docs.ansible.com/ansible/latest/installation_guide/intro_installation.html) for details.
 
 Thanks!
+
+## DEVELOPER CERTIFICATE OF ORIGIN (DCO)
+
+This document was created by the Linux Kernel community and is a simple statement that you, as a contributor, have the legal right to make the contribution.
+
+```text
+Developer Certificate of Origin
+Version 1.1
+
+Copyright (C) 2004, 2006 The Linux Foundation and its contributors.
+1 Letterman Drive
+Suite D4700
+San Francisco, CA, 94129
+
+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.
+```