add CONTRIBUTING.md

Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>

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+Contributing to skiboot
+=======================
+
+skiboot is OPAL (OpenPOWER Abstraction Layer) boot and runtime firmware for
+POWER.
+
+If you haven't already, join us on IRC (#openpower on Freenode) and on
+the mailing list ( skiboot@lists.ozlabs.org - subscribe by
+going to https://lists.ozlabs.org/listinfo/skiboot )
+
+While we do use GitHub Issues, patches are accepted via the mailing list.
+We use GitHub Issues and Pull Requests for tracking contributions. We
+expect participants to adhere to the GitHub Community Guidelines (found
+at https://help.github.com/articles/github-community-guidelines/ ).
+
+If you are unable or unwilling to use GitHub, we can accept contributions
+via the mailing list.
+
+All contributions should have a Developer Certificate of Origin (see below).
+
+Development Environment
+-----------------------
+
+A host GCC of at least 4.9 is recommended (all modern Linux distributions
+provide this).
+
+You can build on x86-64, ppc64 or ppc64le, you just need a powerpc64 (BE)
+cross compiler. The powerpc64le cross compilers packaged in Linux distributions
+can build BE code, so they are fine.
+
+Developer Certificate of Origin
+-------------------------------
+
+Contributions to this project should conform to the `Developer Certificate
+of Origin` as defined at http://elinux.org/Developer_Certificate_Of_Origin.
+Commits to this project need to contain the following line to indicate
+the submitter accepts the DCO:
+```
+Signed-off-by: Your Name <your_email@domain.com>
+```
+By contributing in this way, you agree to the terms as follows:
+```
+Developer Certificate of Origin
+Version 1.1
+
+Copyright (C) 2004, 2006 The Linux Foundation and its contributors.
+660 York Street, Suite 102,
+San Francisco, CA 94110 USA
+
+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.
+```
+
+