Add LICENSE and CONTRIBUTING.md

Author: weavejester

CONTRIBUTING.md

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+# Contributing Guidelines
+
+**Do** follow [the seven rules of a great Git commit message][1].
+
+**Do** follow [the Clojure Style Guide][2].
+
+**Do** include tests for your change when appropriate.
+
+**Do** ensure that the CI checks pass.
+
+**Do** squash the commits in your PR to remove corrections
+irrelevant to the code history, once the PR has been reviewed.
+
+**Do** feel free to pester the project maintainers about the PR if it
+hasn't been responded to. Sometimes notifications can be missed.
+
+**Don't** overuse vertical whitespace; avoid multiple sequential blank
+lines.
+
+**Don't** include more than one feature or fix in a single PR.
+
+**Don't** include changes unrelated to the purpose of the PR. This
+includes changing the project version number, adding lines to the
+`.gitignore` file, or changing the indentation or formatting.
+
+**Don't** open a new PR if changes are requested. Just push to the
+same branch and the PR will be updated.
+
+[1]: https://chris.beams.io/posts/git-commit/#seven-rules
+[2]: https://github.com/bbatsov/clojure-style-guide

LICENSE

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+Copyright (c) 2009-2010 Mark McGranaghan
+Copyright (c) 2009-2018 James Reeves
+ 
+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.