add CONTRIBUTING.md

serves as a brief introduction and adds a link to the gerrit
instructions on webmproject.org.

Bug: webm:1669
Change-Id: If1d483eb48e2edcda8c51e66bdd1a86b7c35b986

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644 (file)
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+# How to Contribute
+
+We'd love to accept your patches and contributions to this project. There are
+just a few small guidelines you need to follow.
+
+## Contributor License Agreement
+
+Contributions to this project must be accompanied by a Contributor License
+Agreement. You (or your employer) retain the copyright to your contribution;
+this simply gives us permission to use and redistribute your contributions as
+part of the project. Head over to <https://cla.developers.google.com/> to see
+your current agreements on file or to sign a new one.
+
+You generally only need to submit a CLA once, so if you've already submitted one
+(even if it was for a different project), you probably don't need to do it
+again.
+
+## Code reviews
+
+All submissions, including submissions by project members, require review. We
+use a [Gerrit](https://www.gerritcodereview.com) instance hosted at
+https://chromium-review.googlesource.com for this purpose.
+
+See https://www.webmproject.org/code/contribute/submitting-patches for an
+example of a typical gerrit workflow.
+
+## Community Guidelines
+
+This project follows
+[Google's Open Source Community Guidelines](https://opensource.google.com/conduct/).