MLBEDSW-2063: Add contributions guidelines

 - Create new CONTRIBUTIONS.md
 - Rearrange README.md to reference new documentation

Signed-off-by: Tim Hall <tim.hall@arm.com>
Change-Id: I502b1606a3fe829a9e242a5de7391bf769203b8c

1 files changed, 37 insertions, 0 deletions

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+# Vela Contributions
+
+Contributions to Vela are very much welcomed!
+
+## Coding Standard
+
+Vela requires Python 3.6 to run. However, it is written using only version 3.5
+language constructs with the addition of Enums (hence requiring 3.6 to run).
+The aim is to maintain this in order to aid compatibility with other tools.
+
+## Submitting
+
+In order to submit a contribution please submit a Change Request (CR) to the
+[Vela Gerrit Server](https://review.mlplatform.org/q/project:ml%252Fethos-u%252Fethos-u-vela).
+To do this you will need to sign-in to the platform using a GitHub account.
+
+## Contribution Guidelines
+
+Contributions are only accepted under the following conditions:
+
+* You certify that the origin of the submission conforms to the
+[Developer Certificate of Origin (DCO) V1.1](https://developercertificate.org/)
+* You give permission according to the [Apache License 2.0](LICENSE.txt).
+
+To indicate that you agree to the contribution guidelines you must add an
+appropriate 'Signed-off-by: Real Name username@example.org' line with your real
+name and e-mail address to every commit message.  This can be done automatically
+by adding the `-s` option to your `git commit` command.
+
+No contributions will be accepted from pseudonyms or anonymous sources.
+
+## Code Reviews
+
+All contributions go through a code review process.  Only submissions that are
+approved and verified by this process will be accepted.  Code reviews are
+performed using the
+[Vela Gerrit Server](https://review.mlplatform.org/q/project:ml%252Fethos-u%252Fethos-u-vela).