add CONTRIBUTING and CODE_OF_CONDUCT

CODE_OF_CONDUCT.md

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+# Code of Conduct
+
+One of Smile's strengths is our community. To push Smile to amazing new levels,
+we rely on an open, friendly, inclusive environment to facilitate this.
+As such, we follow the [Contributor Covenant](http://contributor-covenant.org/)'s
+[Code of Conduct](http://contributor-covenant.org/version/1/4/code-of-conduct.md)
+to ensure a harassment-free experience in the Smile community.
+
+This applies to the main Smile repo, forum, twitter, and all channels.

CONTRIBUTING.md

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+# How to contribute to Smile
+Welcome! If you are interested in contributing to Smile, reporting issues,
+or just getting in touch with the folks who work on Smile, this guide is
+for you.
+
+One of the easiest ways to contribute is to participate in discussions
+and discuss issues. You can also contribute by opening an issue and
+submitting a pull request with code changes.
+
+## Open an issue
+For bugs, issues, or other discussion, please log a new issue in the GitHub repo.
+
+GitHub supports [markdown](https://help.github.com/categories/writing-on-github/),
+so when filing bugs make sure you check the formatting before clicking submit.
+
+## Other discussions
+For general "how-to" and guidance questions about using Smile to build
+and run applications, please use [Stack Overflow](http://stackoverflow.com/questions/tagged/smile-ai)
+tagged with `smile-ai`.
+
+## Contributing code and content
+We welcome all forms of contributions from the community. Please read the
+following guidelines to maximize the chances of your PR being merged.
+
+### Communication
+ - Before starting work on a feature, please open an issue on GitHub
+   describing the proposed feature. We want to make sure any feature
+   work goes smoothly. We're happy to work with you to determine if
+   it fits the current project direction and make sure no one else
+   is already working on it.
+
+ - For any work related to setting up build, test, and CI for Smile
+   on GitHub, or for small patches or bug fixes, please open an issue
+   for tracking purposes, but we generally don't need a discussion
+   prior to opening a PR.
+
+### Development process
+Please be sure to follow the usual process for submitting PRs:
+
+ - Fork the repo
+ - Create a pull request
+ - Make sure your PR title is descriptive
+ - Include a link back to an open issue in the PR description
+
+We reserve the right to close PRs that are not making progress. Closed PRs can be reopened again later and work can resume.
+
+### Contributor License Agreement
+By contributing your code to Smile you grant us a non-exclusive,
+irrevocable, worldwide, royalty-free, sublicenseable, transferable
+license under all of Your relevant intellectual property rights
+(including copyright, patent, and any other rights), to use, copy,
+prepare derivative works of, distribute and publicly perform and
+display the Contributions on any licensing terms, including without limitation:
+(a) open source licenses like the Apache license; and (b) binary,
+proprietary, or commercial licenses. Except for the licenses granted herein,
+You reserve all right, title, and interest in and to the Contribution.
+
+You confirm that you are able to grant us these rights. You represent
+that You are legally entitled to grant the above license. If Your employer
+has rights to intellectual property that You create, You represent that
+You have received permission to make the Contributions on behalf of that
+employer, or that Your employer has waived such rights for the Contributions.
+
+You represent that the Contributions are Your original works of
+authorship, and to Your knowledge, no other person claims, or
+has the right to claim, any right in any invention or patent
+related to the Contributions. You also represent that You are
+not legally obligated, whether by entering into an agreement
+or otherwise, in any way that conflicts with the terms of this license.
+
+We acknowledge that, except as explicitly described in this
+Agreement, any Contribution which you provide is on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
+EITHER EXPRESS OR IMPLIED, INCLUDING, WITHOUT LIMITATION,
+ANY WARRANTIES OR CONDITIONS OF TITLE, NON-INFRINGEMENT,
+MERCHANTABILITY, OR FITNESS FOR A PARTICULAR PURPOSE.
+
+## Code of Conduct
+To ensure an inclusive community, contributors and users in the Smile
+community should follow the [code of conduct](./CODE_OF_CONDUCT.md).