add license and contributing policy

Author: arnoudbuzing

CONTRIBUTING.md

@@ -0,0 +1,40 @@
+# Contributing to Wolfram<sup>&reg;</sup>
+
+Thank you for taking the time to contribute to the [Wolfram Research](https://github.com/wolframresearch) repos on GitHub.
+
+## Licensing of Contributions
+
+By contributing to Wolfram, you agree and affirm that:
+
+> Wolfram may release your contribution under the terms of the [MIT license](https://opensource.org/licenses/MIT); and
+
+> You have read and agreed to the [Developer Certificate of Origin](http://developercertificate.org/), version 1.1 or later.
+
+Please see [LICENSE](LICENSE) for licensing conditions pertaining
+to individual repositories.
+
+
+## Bug reports
+
+### Security Bugs
+
+Please **DO NOT** file a public issue regarding a security issue.
+Rather, send your report privately to [email protected].  Security
+reports are appreciated and we will credit you for it.  We do not offer
+a security bounty, but the forecast in your neighborhood will be cloudy
+with a chance of Wolfram schwag!
+
+### General Bugs
+
+Please use the repository issues page to submit general bug issues.
+
+Please do not duplicate issues.
+
+Please do send a complete and well-written report to us.  Note:  **the
+thoroughness of your report will positively correlate to our willingness
+and ability to address it**.
+
+When reporting issues, always include:
+
+* Your version of *Mathematica*<sup>&reg;</sup> or the Wolfram Language<sup>&trade;</sup>.
+* Your operating system.

LICENSE

@@ -0,0 +1,18 @@
+Copyright 2018 Wolfram Research Inc.
+
+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.