The Mbed TLS project no longer requires a CLA. Contributions from now on
must be made under both Apache-2.0 AND GPL-2.0-or-later licenses, to enable
LTS (Long Term Support) branches of the software to continue to be provided
under either Apache-2.0 OR GPL-2.0-or-later. Contributors must accept the
terms of the Developer Certificate of Origin (DCO) by adding a
Signed-off-by: line to each commit message.
The software on the development branch continues to be provided under
Apache-2.0.
Add CONTRIBUTING.md, and update README.md and pull_request_template.md to
explain the new licensing model. Add a copy of the DCO to the project.
Signed-off-by: Dan Handley <dan.handley@arm.com>
