Add contributing and license files

CONTRIBUTING.md

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+## Team Processes
+
+* Use PEP8 as the coding standard for Python.
+* Pull requests for all commits, even typos.
+* Don't merge your own pull request. Find a friend to review your code and merge your pull request.
+* Pull requests some contain some tests. Ideally they would contain decent test coverage.
+* If you make changes to the API, please help update the API documentation. 
+
+When creating a new pull request:
+
+* If the pull request is still a work-in-progress and should not be merged, say so in the description and then **assign the PR to yourself**. When the PR is ready to be merged, **unassign yourself and add a comment**.
+* If a new pull request is ready for review, **leave it unassigned**. This is the assumed state of new PRs, but work-in-progress PRs are quite welcome.
+* If you decide to review a pull request with the intent of merging it (or deciding what still needs to be done before merge), then **assign the PR to yourself** so that it's clear that someone's grabbed it.
+* Anyone is welcome to informally review a PR and comment on it at any time, no matter who is assigned.
+
+## Public domain
+
+This project is in the public domain within the United States, and
+copyright and related rights in the work worldwide are waived through
+the [CC0 1.0 Universal public domain dedication](https://creativecommons.org/publicdomain/zero/1.0/).
+
+All contributions to this project will be released under the CC0
+dedication. By submitting a pull request, you are agreeing to comply
+with this waiver of copyright interest.
+

LICENSE.md

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+# Public domain
+
+As a work of the United States Government, this project is in the
+public domain within the United States.
+
+Additionally, we waive copyright and related rights in the work
+worldwide through the CC0 1.0 Universal public domain dedication.
+
+## CC0 1.0 Universal Summary
+
+This is a human-readable summary of the
+[Legal Code (read the full text)](https://creativecommons.org/publicdomain/zero/1.0/legalcode).
+
+### No Copyright
+
+The person who associated a work with this deed has dedicated the work to
+the public domain by waiving all of his or her rights to the work worldwide
+under copyright law, including all related and neighboring rights, to the
+extent allowed by law.
+
+You can copy, modify, distribute and perform the work, even for commercial
+purposes, all without asking permission.
+
+### Other Information
+
+In no way are the patent or trademark rights of any person affected by CC0,
+nor are the rights that other persons may have in the work or in how the
+work is used, such as publicity or privacy rights.
+
+Unless expressly stated otherwise, the person who associated a work with
+this deed makes no warranties about the work, and disclaims liability for
+all uses of the work, to the fullest extent permitted by applicable law.
+When using or citing the work, you should not imply endorsement by the
+author or the affirmer.