Adopt the Swift CoC (#691)

Motivation:

We're centralizing on the Swift code of conduct, so we'll x-reference
that instead of holding our own.

Modifications:

Hyperlink out to Swift.

Result:

Shared CoC across the projects.

CODE_OF_CONDUCT.md

@@ -1,55 +1,5 @@
 # Code of Conduct
-To be a truly great community, AsyncHTTPClient needs to welcome developers from all walks of life,
-with different backgrounds, and with a wide range of experience. A diverse and friendly
-community will have more great ideas, more unique perspectives, and produce more great
-code. We will work diligently to make the AsyncHTTPClient community welcoming to everyone.
 
-To give clarity of what is expected of our members, AsyncHTTPClient has adopted the code of conduct
-defined by [contributor-covenant.org](https://www.contributor-covenant.org). This document is used across many open source
-communities, and we think it articulates our values well. The full text is copied below:
+The code of conduct for this project can be found at https://swift.org/code-of-conduct.
 
-### Contributor Code of Conduct v1.3
-As contributors and maintainers of this project, and in the interest of fostering an open and
-welcoming community, we pledge to respect all people who contribute through reporting
-issues, posting feature requests, updating documentation, submitting pull requests or patches,
-and other activities.
-
-We are committed to making participation in this project a harassment-free experience for
-everyone, regardless of level of experience, gender, gender identity and expression, sexual
-orientation, disability, personal appearance, body size, race, ethnicity, age, religion, or
-nationality.
-
-Examples of unacceptable behavior by participants include:
-- The use of sexualized language or imagery
-- Personal attacks
-- Trolling or insulting/derogatory comments
-- Public or private harassment
-- Publishing other’s private information, such as physical or electronic addresses, without explicit permission
-- Other unethical or unprofessional conduct
-
-Project maintainers have the right and responsibility to remove, edit, or reject comments,
-commits, code, wiki edits, issues, and other contributions that are not aligned to this Code of
-Conduct, or to ban temporarily or permanently any contributor for other behaviors that they
-deem inappropriate, threatening, offensive, or harmful.
-
-By adopting this Code of Conduct, project maintainers commit themselves to fairly and
-consistently applying these principles to every aspect of managing this project. Project
-maintainers who do not follow or enforce the Code of Conduct may be permanently removed
-from the project team.
-
-This code of conduct applies both within project spaces and in public spaces when an
-individual is representing the project or its community.
-
-Instances of abusive, harassing, or otherwise unacceptable behavior may be reported by
-contacting a project maintainer at [conduct@swiftserver.group](mailto:conduct@swiftserver.group). All complaints will be reviewed and
-investigated and will result in a response that is deemed necessary and appropriate to the
-circumstances. Maintainers are obligated to maintain confidentiality with regard to the reporter
-of an incident.
-
-*This policy is adapted from the Contributor Code of Conduct [version 1.3.0](https://contributor-covenant.org/version/1/3/0/).*
-
-### Reporting
-A working group of community members is committed to promptly addressing any [reported issues](mailto:conduct@swiftserver.group).
-Working group members are volunteers appointed by the project lead, with a
-preference for individuals with varied backgrounds and perspectives. Membership is expected
-to change regularly, and may grow or shrink.
+<!-- Copyright (c) 2023 Apple Inc and the Swift Project authors. All Rights Reserved. -->