Updated contributing guidelines and license.

Closes KSP-CKAN#88.

CONTRIBUTING.md

@@ -0,0 +1,20 @@
+### Code of Conduct
+
+A primary goal of the Comprehensive Kerbal Archive Network (CKAN) is to be inclusive to the largest number of contributors, with the most varied and diverse backgrounds possible. As such, we are committed to providing a friendly, safe and welcoming environment for all, regardless of gender, sexual orientation, ability, ethnicity, socioeconomic status, and religion (or lack thereof).
+
+All participants and contributors are expected to follow our
+[code of conduct](https://github.com/KSP-CKAN/CKAN/wiki/Code-of-Conduct).
+
+### Reporting bugs and opening issues
+
+Please report bugs and open issue generously. Don't be afraid that your idea is silly, or you're reporting a duplicate. We're happy to hear from you.
+
+### Code and other contributions
+
+Contributions to the CKAN (via pull request or otherwise) *must* be
+licensed under the [MIT license](LICENSE.md).
+
+### Submission of CKAN metadata files (.ckan files)
+
+Contributions of CKAN metadata files *must* be be contributed under the
+[CC-0](http://creativecommons.org/publicdomain/zero/1.0/) license.

LICENSE.md

@@ -1,3 +1,15 @@
-This project, and all associated files, are licensed under your
-choice of the Creative Commons Attribution license 4.0 (CC-BY 4.0),
-Lesser GNU Public License (LGPL), or the MIT license (MIT).
+You can use the CKAN and its associated files under the MIT license,
+reproduced below. This includes the right to sublicense under compatible
+licenses, including (but not limited to) creative commons, GPL, and LGPL
+licenses.
+
+---
+
+Copyright the Comprehensive Kerbal Archive Network (CKAN) Authors.
+https://github.com/KSP-CKAN/CKAN/graphs/contributors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.