Added support guide.

Author: xeioex

SUPPORT.md

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+# Support
+
+## Ask a Question
+
+We use GitHub for tracking bugs and feature requests related to njs.
+
+Don't know how something in this project works? Curious if this project can achieve your desired functionality? Please open an issue on GitHub with the label `question`.
+
+## NGINX Specific Questions and/or Issues
+
+This isn't the right place to get support for NGINX specific questions, but the following resources are available below. Thanks for your understanding!
+
+### Community Slack
+
+We have a community [Slack](https://nginxcommunity.slack.com/)!
+
+If you are not a member, click [here](https://community.nginx.org/joinslack) to sign up (and let us know if the link does not seem to be working!)
+
+Once you join, check out the `#beginner-questions` and `nginx-users` channels :)
+
+### Documentation
+
+For a comprehensive list of all NGINX directives, check out <https://nginx.org/en/docs/dirindex.html>.
+
+For a comprehensive list of admin and deployment guides for all NGINX products, check out <https://docs.nginx.com>.
+
+### Mailing List
+
+Want to get in touch with the NGINX development team directly? Try using the relevant mailing list found at <https://mailman.nginx.org/mailman3/lists/>!
+
+## Contributing
+
+Please see the [contributing guide](CONTRIBUTING.md) for guidelines on how to best contribute to this project.
+
+## Commercial Support
+
+Commercial support for this project may be available. Please get in touch with [NGINX sales](https://www.nginx.com/contact-sales/) or check your contract details for more info!