Update CONTRIBUTING.md

Also add code of conduct.

Author: brunchboy

CODE_OF_CONDUCT.md

@@ -0,0 +1,76 @@
+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+In the interest of fostering an open and welcoming environment, we as
+contributors and maintainers pledge to making participation in our project and
+our community a harassment-free experience for everyone, regardless of age, body
+size, disability, ethnicity, sex characteristics, gender identity and expression,
+level of experience, education, socio-economic status, nationality, personal
+appearance, race, religion, or sexual identity and orientation.
+
+## Our Standards
+
+Examples of behavior that contributes to creating a positive environment
+include:
+
+* Using welcoming and inclusive language
+* Being respectful of differing viewpoints and experiences
+* Gracefully accepting constructive criticism
+* Focusing on what is best for the community
+* Showing empathy towards other community members
+
+Examples of unacceptable behavior by participants include:
+
+* The use of sexualized language or imagery and unwelcome sexual attention or
+ advances
+* Trolling, insulting/derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or electronic
+ address, without explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+ professional setting
+
+## Our Responsibilities
+
+Project maintainers are responsible for clarifying the standards of acceptable
+behavior and are expected to take appropriate and fair corrective action in
+response to any instances of unacceptable behavior.
+
+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.
+
+## Scope
+
+This Code of Conduct applies both within project spaces and in public spaces
+when an individual is representing the project or its community. Examples of
+representing a project or community include using an official project e-mail
+address, posting via an official social media account, or acting as an appointed
+representative at an online or offline event. Representation of a project may be
+further defined and clarified by project maintainers.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported by contacting the project team at [email protected]. All
+complaints will be reviewed and investigated and will result in a response that
+is deemed necessary and appropriate to the circumstances. The project team is
+obligated to maintain confidentiality with regard to the reporter of an incident.
+Further details of specific enforcement policies may be posted separately.
+
+Project maintainers who do not follow or enforce the Code of Conduct in good
+faith may face temporary or permanent repercussions as determined by other
+members of the project's leadership.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4,
+available at https://www.contributor-covenant.org/version/1/4/code-of-conduct.html
+
+[homepage]: https://www.contributor-covenant.org
+
+For answers to common questions about this code of conduct, see
+https://www.contributor-covenant.org/faq

CONTRIBUTING.md

@@ -30,19 +30,29 @@ ports, so you can listen in on the traffic players and mixers send
 between themselves. The [Netgear GS105Ev2][switch] has worked great
 for us.
 
+> [!IMPORTANT]
+> Before doing any significant work, we strongly encourage you to discuss your ideas in the [Zulip channel][zulip].
+> This will help make sure you’re on the right track, could save you a lot of effort, and ensure alignment with the overall project philosophy and goals.
+
+### Code from AI / LLM Tools
+
+If you are planning to contribute code, please refrain from copy and pasting it from “AI” code assistants and large language models.
+It is fine to use those as an inspiration, or examples of the ways something could be done, but always write your own code from scratch if you are going to submit it to the project.
+
+> [!WARNING]
+> Code from online coding assistants may be plagiarized from other projects with incompatible licenses (and there is no way to know), and may include subtle bugs.
+> It is not suitable for submission to Deep Symmetry projects.
+
 ## Giving back
 
 The most informal and fun way to get involved in the project is to
 introduce yourself and start chatting on the [Zulip
-stream](https://deep-symmetry.zulipchat.com/#narrow/stream/275855-dysentery-.26-crate-digger).
+channel][zulip].
 
 Once you have something working you’d like to share, you can open a
 [pull request][pulls].
 
-Or if you simply have an idea, or something that you wish worked
-differently, feel free to open an [issue][issues] if it seems like
-nobody already has.
-
+Or if you simply have an idea, or something that you wish worked differently, feel free to discuss it in the [Zulip channel][zulip], and if directed to do so by the community there, open an [issue][issues].
 ## Maintainers
 
 Crate Digger is primarily maintained by [@brunchboy][brunchboy].
@@ -51,7 +61,7 @@ Crate Digger is primarily maintained by [@brunchboy][brunchboy].
 
 <a href="http://deepsymmetry.org"><img src="doc/assets/DS-logo-github.png"
       align="right" alt="Deep Symmetry logo" width="250" height="150"></a>
-Copyright © 2018–2022 [Deep Symmetry, LLC](http://deepsymmetry.org)
+Copyright © 2018–2022 [Deep Symmetry, LLC][deep-symmetry]
 
 Distributed under the [Eclipse Public License
 2.0](https://opensource.org/licenses/EPL-2.0). By using this software
@@ -66,12 +76,14 @@ satisfied: [Mozilla Public License
 2.0](https://www.mozilla.org/en-US/MPL/2.0/), or [GNU Lesser General
 Public License v. 3](https://opensource.org/licenses/LGPL-3.0).
 
+[brunchboy]: https://github.com/brunchboy
 [contributions-released]: https://help.github.com/articles/github-terms-of-service/#6-contributions-under-repository-license
-[covenant]: http://contributor-covenant.org/
-[maven]: https://maven.apache.org
-[idea]: https://www.jetbrains.com/idea/
+[covenant]: https://contributor-covenant.org/
+[deep-symmetry]: https://deepsymmetry.org
 [emacs]: https://www.gnu.org/software/emacs/
-[switch]: https://smile.amazon.com/gp/product/B00HGLVZLY/
-[pulls]: https://github.com/Deep-Symmetry/crate-digger/pulls
+[idea]: https://www.jetbrains.com/idea/
 [issues]: https://github.com/Deep-Symmetry/crate-digger/issues
-[brunchboy]: https://github.com/brunchboy
+[maven]: https://maven.apache.org
+[pulls]: https://github.com/Deep-Symmetry/crate-digger/pulls
+[switch]: https://smile.amazon.com/gp/product/B00HGLVZLY/
+[zulip]: https://deep-symmetry.zulipchat.com/#narrow/stream/275855-dysentery-.26-crate-digger