Merge pull request facebookresearch#197 from facebookresearch/contrib…

…uting

Add code of conduct and contributing statements.

CODE_OF_CONDUCT.md

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+# Code of Conduct
+
+Facebook has adopted a Code of Conduct that we expect project participants to adhere to. Please read the [full text](https://code.fb.com/codeofconduct/)) so that you can understand what actions will and will not be tolerated.

CONTRIBUTING.md

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+# Contributing to DrQA
+
+While we are seeding this project with an initial set of popular tasks and a few
+models and examples, ongoing contributions from the research community are
+desired to increase the pool of tasks, models, and baselines.
+
+## Pull Requests
+We actively welcome your pull requests.
+
+1. Fork the repo and create your branch from `master`.
+2. If you've added code that should be tested, add tests.
+3. If you've changed APIs, update the documentation.
+4. Ensure the test suite passes. Run `python setup.py test`. If you've added a new
+   dataset, you should run add a tests for it in `tests/data`.
+5. Make sure your code lints (`bash tests/lint_changed.sh`)
+6. If you haven't already, complete the Contributor License Agreement ("CLA").
+
+## Contributor License Agreement ("CLA")
+In order to accept your pull request, we need you to submit a CLA. You only need
+to do this once to work on any of Facebook's open source projects.
+
+Complete your CLA here: <https://code.facebook.com/cla>
+
+## Issues
+We use GitHub issues for general feature discussion, Q&A and public bugs tracking.
+Please ensure your description is clear and has sufficient instructions to be able to
+reproduce the issue or understand the problem.
+
+Facebook has a [bounty program](https://www.facebook.com/whitehat/) for the safe
+disclosure of security bugs. In those cases, please go through the process
+outlined on that page and do not file a public issue.
+
+## Coding Style
+We try to follow the PEP style guidelines and encourage you to as well.
+
+## License
+By contributing to DrQA, you agree that your contributions will be licensed
+under the LICENSE file in the root directory of this source tree.