Add DCO information

Signed-off-by: Andy Goldstein <andy.goldstein@redhat.com>

CONTRIBUTING.md

@@ -2,6 +2,15 @@
 
 Operator Controller is an Apache 2.0 licensed project and accepts contributions via GitHub pull requests (PRs).
 
+## 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.
+
+## Overview
+
 Thank you for your interest in contributing to the Operator-Controller.
 
 As you may or may not know, the Operator-Controller project aims to deliver the user experience described in the [Operator Lifecycle Manager (OLM) V1 Product Requirements Document (PRD)](https://docs.google.com/document/d/1-vsZ2dAODNfoHb7Nf0fbYeKDF7DUqEzS9HqgeMCvbDs/edit). The design requirements captured in the OLM V1 PRD were born from customer and community feedback based on the experience they had with the released version of [OLM V0](github.com/operator-framework/operator-lifecycle-manager).

DCO

@@ -0,0 +1,37 @@
+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.