Add the standard Metal3 files, including OWNERS

CONTRIBUTING.md

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+# How to Contribute
+
+Metal3 projects are [Apache 2.0 licensed](LICENSE) and accept contributions via
+GitHub pull requests.
+
+<!-- START doctoc generated TOC please keep comment here to allow auto update -->
+<!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
+
+- [Certificate of Origin](#certificate-of-origin)
+   - [Git commit Sign-off](#git-commit-sign-off)
+
+<!-- END doctoc generated TOC please keep comment here to allow auto update -->
+
+## Certificate of Origin
+
+By contributing to this project you agree to the 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. See the [DCO](DCO) file for details.
+
+### Git commit Sign-off
+
+Commit message should contain signed off section with full name and email. For example:
+
+ ```text
+  Signed-off-by: John Doe <[email protected]>
+ ```
+
+When making commits, include the `-s` flag and `Signed-off-by` section will be automatically
+added to your commit message. If you want GPG signing too, add the `-S` flag alongside `-s`.
+
+```bash
+  # Signing off commit
+  git commit -s
+
+  # Signing off commit and also additional signing with GPG
+  git commit -s -S
+```

DCO

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+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.

OWNERS

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+# See the OWNERS docs at https://go.k8s.io/owners
+
+approvers:
+ - dtantsur