Adding docs that describe how to contribute (#9)

.github/PULL_REQUEST_TEMPLATE.md

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+[ ] This contribution adheres to [CONTRIBUTING.md](https://github.com/ni/nifpga-python/blob/master/CONTRIBUTING.md).
+
+TODO: Check the above box with an 'x' indicating you've read and followed [CONTRIBUTING.md](https://github.com/ni/nifpga-python/blob/master/CONTRIBUTING.md).
+
+### What does this Pull Request accomplish?
+
+TODO: Include high-level description of the changes in this pull request.
+
+### Why should this Pull Request be merged?
+
+TODO: Justify why this contribution should be part of the project.
+
+### What testing has been done?
+
+TODO: Detail what testing has been done to ensure this submission meets requirements.

CONTRIBUTING.md

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+# Contributing to nifpga-python
+
+Contributions to nifpga-python are welcome from all!
+
+nifpga-python is managed via [git](https://git-scm.com), with the canonical upstream
+repository hosted on [GitHub](http://github.com/).
+
+nifpga-python follows a pull-request model for development.  If you wish to
+contribute, you will need to create a GitHub account, fork this project, push a
+branch with your changes to your project, and then submit a pull request.
+
+See [GitHub's official documentation](https://help.github.com/articles/using-pull-requests/) for more details.
+
+# Testing
+
+This project uses [Travis CI](https://travis-ci.org/ni/nifpga-python/).  Use it
+to test your branch ahead of time and it will also be run on all pull-requests.
+
+# Developer Certificate of Origin (DCO)
+
+   Developer's Certificate of Origin 1.1
+
+   By making a contribution to this project, I certify that:
+
+   (a) The contribution was created in whole or in part by me and I
+       have the right to submit it under the open source license
+       indicated in the file; or
+
+   (b) The contribution is based upon previous work that, to the best
+       of my knowledge, is covered under an appropriate open source
+       license and I have the right under that license to submit that
+       work with modifications, whether created in whole or in part
+       by me, under the same open source license (unless I am
+       permitted to submit under a different license), as indicated
+       in the file; or
+
+   (c) The contribution was provided directly to me by some other
+       person who certified (a), (b) or (c) and I have not modified
+       it.
+
+   (d) I understand and agree that this project and the contribution
+       are public and that a record of the contribution (including all
+       personal information I submit with it, including my sign-off) is
+       maintained indefinitely and may be redistributed consistent with
+       this project or the open source license(s) involved.
+
+(taken from [developercertificate.org](http://developercertificate.org/))
+
+See [LICENSE](https://github.com/ni/nifpga-python/blob/master/LICENSE)
+for details about how nifpga-python is licensed.