add CoC, contributing, copyrights

Author: ctoney

CODE_OF_CONDUCT.md

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+# Code of Conduct
+
+See the the General Services Administration (GSA)’s Technology Transformation Services (TTS) [Code of Conduct](https://handbook.tts.gsa.gov/about-us/code-of-conduct/).

CONTRIBUTING.md

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+# Welcome
+
+We're glad you're thinking about contributing to this open source project of the USDA Forest Service, Rocky Montain Research Station. We want to ensure a welcoming environment. If you're unsure about anything, just ask -- or submit an issue or pull request anyway. The worst that can happen is you'll be politely asked to change something. We welcome all friendly contributions.
+
+## Public domain
+
+This project is released under [MIT license](https://cran.r-project.org/web/licenses/MIT). Portions of the project are in the public domain within the United States, with copyright and related rights waived worldwide through the [CC0 1.0 Universal public domain dedication](https://creativecommons.org/publicdomain/zero/1.0/). See file inst/COPYRIGHTS for details.

inst/COPYRIGHTS

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+=====All other files ==========================================================
+All files in this package other than those referred to above, were prepared by
+Chris Toney, a U.S. Government employee working on official time, and are in
+the public domain in the United States of America. Copyright and related rights
+in the work are also waived worldwide through the CC0 1.0 Universal public
+domain dedication.
+
+The software is provided "as is" without warranty of any kind, either expressed
+or implied, including, but not limited to, the implied warranties of
+merchantability and fitness for a particular purpose. In no event shall the
+author be held liable for any damages arising from the use of this software.
+===============================================================================
+
+This package is licensed under MIT + file LICENSE.