Create README.md (#7)

Co-authored-by: jgraham <[email protected]>

Author: saschanaz

README.md

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+This repository hosts the [Test Utils Standard](https://testutils.spec.whatwg.org/).
+
+## Code of conduct
+
+We are committed to providing a friendly, safe, and welcoming environment for all. Please read and
+respect the [WHATWG Code of Conduct](https://whatwg.org/code-of-conduct).
+
+## Contribution opportunities
+
+We'd love your help fixing issues in the Test Utils standard. Pull requests for typographical and
+grammar errors are also most welcome.
+
+We'd be happy to mentor you through this process. If you're interested and need help getting
+started, leave a comment on the issue or ask around 
+[on Matrix](https://matrix.to/#/#whatwg:matrix.org).
+
+## Pull requests
+
+In short, change `index.bs` and submit your patch, with a
+[good commit message](https://github.com/whatwg/meta/blob/main/COMMITTING.md). Consider
+reading through the [WHATWG FAQ](https://whatwg.org/faq) if you are new here.
+
+Please add your name to the Acknowledgments section in your first pull request, even for trivial
+fixes. The names are sorted lexicographically.
+
+## Building "locally"
+
+For quick local iteration, run `make`. To verify your changes locally, run `make deploy`. See more
+in the
+[WHATWG Contributor Guidelines](https://github.com/whatwg/meta/blob/main/CONTRIBUTING.md#building).
+
+## Merge policy
+
+If you can commit to this repository, see the
+[maintainer guidelines](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md).