Add contributor guide

CONTIBUTING.md

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+# Contributing to Pulumi
+
+First, thanks for contributing to Pulumi and helping make it better. We appreciate the help!
+This repository is one of many across the Pulumi ecosystem and we welcome contributions to them all.
+
+## Code of Conduct
+
+Please make sure to read and observe our [Contributor Code of Conduct](https://github.com/pulumi/pulumi/blob/master/CONTRIBUTING.md).
+
+## Communications
+
+You are welcome to join the [Pulumi Community Slack](https://slack.pulumi.com/) for questions and a community of like-minded folks.
+We discuss features and file bugs on GitHub via [Issues](https://github.com/pulumi/pulumi-docker-containers/issues). You can read about our [public roadmap](https://github.com/orgs/pulumi/projects/44) on the [Pulumi blog](https://www.pulumi.com/blog/relaunching-pulumis-public-roadmap/).
+
+## Issues
+
+Feel free to pick up any existing issue that looks interesting to you or fix a bug you stumble across while using Pulumi. No matter the size, we welcome all improvements. Our [Help Wanted](https://github.com/pulumi/pulumi-docker-containers/issues?q=is%3Aissue+is%3Aopen+label%3Ahelp-wanted) label tracks our contribution wishlist, and the [Good First Issue](https://github.com/pulumi/pulumi-docker-containers/issues?q=is%3Aissue+is%3Aopen+label%3Agood-first-issue) label is a great place to start if you're looking to get started.
+
+## Submitting a Pull Request
+
+For contributors we use the [standard fork based workflow](https://gist.github.com/Chaser324/ce0505fbed06b947d962): Fork this repository, create a topic branch, and when ready, open a pull request from your fork.
+
+## Getting Help
+
+We're sure there are rough edges and we appreciate you helping out. If you want to talk with other folks in the Pulumi community (including members of the Pulumi team) come hang out in the `#contribute` channel on the [Pulumi Community Slack](https://slack.pulumi.com/).