Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing Guidelines
+
+Contributions welcome!
+
+**Before spending lots of time on something, ask for feedback on your idea first!**
+
+Please search issues and pull requests before adding something new to avoid duplicating
+efforts and conversations.
+
+This project welcomes non-code contributions, too! The following types of contributions
+are welcome:
+
+- **Ideas**: participate in an issue thread or start your own to have your voice heard.
+- **Writing**: contribute your expertise in an area by helping expand the included docs.
+- **Copy editing**: fix typos, clarify language, and improve the quality of the docs.
+- **Formatting**: help keep docs easy to read with consistent formatting.
+
+## Code Style
+
+[![standard][standard-image]][standard-url]
+
+This repository uses [`standard`][standard-url] to maintain code style and consistency,
+and to avoid style arguments. `npm test` runs `standard` automatically, so you don't have
+to!
+
+[standard-image]: https://cdn.rawgit.com/standard/standard/master/badge.svg
+[standard-url]: https://github.com/standard/standard
+
+## Project Governance
+
+Individuals making significant and valuable contributions are given commit-access to the
+project to contribute as they see fit. This project is more like an open wiki than a
+standard guarded open source project.
+
+### Rules
+
+There are a few basic ground-rules for contributors:
+
+1. **No `--force` pushes** or modifying the Git history in any way.
+2. **Non-master branches** should be used for ongoing work.
+3. **Significant modifications** like API changes should be subject to a **pull request**
+   to solicit feedback from other contributors.
+4. **Pull requests** are *encouraged* for all contributions to solicit feedback, but left to
+   the discretion of the contributor.
+
+### Releases
+
+Declaring formal releases remains the prerogative of the project maintainer.
+
+### Changes to this arrangement
+
+This is an experiment and feedback is welcome! This document may also be subject to pull-
+requests or changes by contributors where you believe you have something valuable to add
+or change.
+
+## 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.