Merge pull request #77 from mhdawson/addgov

doc: add governance files

Author: jonchurch

CODE_OF_CONDUCT.md

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+# Code of Conduct
+
+The Node.js Code of Conduct, which applies to this project, can be found at
+https://github.com/nodejs/admin/blob/master/CODE_OF_CONDUCT.md.

CONTRIBUTING.md

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+# Contributing
+
+## Code of Conduct
+
+The Node.js project has a
+[Code of Conduct](https://github.com/nodejs/admin/blob/master/CODE_OF_CONDUCT.md)
+to which all contributors must adhere.
+
+See [details on our policy on Code of Conduct](https://github.com/nodejs/node/blob/master/doc/guides/contributing/code-of-conduct.md).
+
+<a id="developers-certificate-of-origin"></a>
+## 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.