Add a code of conduct

CODE_OF_CONDUCT.md

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+# Code of Conduct
+## 1. Overview
+
+The goal of the FreeRADIUS project is to produce reliable, feature full software which benefits the
+open source community.
+
+The GitHub issue tracker and mailing lists have a strict code of conduct.
+
+> Only technical discussion related to FreeRADIUS, the protocols it implements, and its dependencies
+> are permitted in GitHub communications and on the mailing list.
+> 
+> Please note that any off-topic discussion will result in a warning. Continued off topic discussion
+> will result in the individual being unsubscribed from the mailing lists and/or permanent
+> banishment from the GitHub repositories.
+
+This code of conduct is simple to abide by, and simple to enforce. Unlike other codes of conduct it
+does not require participants to be explicitly "inclusive" or "accepting" of certain topics. It
+requires participants to be blind to non-technical topics, as those subjects are explicitly off
+topic. The FreeRADIUS community is inclusive by not being exclusive.
+
+## 2. Expected Behaviour
+
+The following behaviours are expected and requested of all community members:
+
+- Ensure that the rules of the community resource you're using have been reviewed in full, [mailing
+  list guidelines](http://freeradius.org/list/) for the mailing lists, [the guidelines for
+  contributing](https://github.com/FreeRADIUS/freeradius-server/blob/v4.0.x/.github/contributing.md)
+  for GitHub.
+- Use a neutral tone with a focus on technical arguments and technical discussion.
+- Evaluate contributions, ideas and feedback on technical merit only.  The personal attributes of
+  community members are entirely irrelevant and comments of this nature will not be tolerated.
+- Research topics using appropriate standards, design documents, and technical manuals before raising
+  GitHub issues, or sending pull requests.
+  _The FreeRADIUS project has three core team members, around seventy modules, and a very large list 
+  of dependencies. We cannot be experts on every part of the
+  FreeRADIUS ecosystem and rely on well researched and technically sound contributions to make the
+  project a success._
+
+## 3. Unacceptable Behaviour
+
+The following behaviours are unacceptable within our community:
+
+- Non-technical discussion.
+- Ad hominem attacks and other personal attacks.
+- Willful ignorance.
+
+## 4. Consequences of Unacceptable Behaviour
+
+Where unacceptable behaviour is noted and the community participant informed of behaviour and next
+steps, the community participant is expected to comply immediately.
+
+The community organizers will take any action they deem appropriate, which may include permanent
+expulsion from the community using appropriate mechanisms.
+
+## 5. Reporting Guidelines
+
+If you are subject to or witness unacceptable behaviour or have any other concerns, please notify a
+community organizer as soon as possible. social@freeradius.org.
+
+## 6. Scope
+
+We expect all community members, including those who contribute to the project financially or are in
+positions of power within the community, to abide by this Code of Conduct in all venues and over all
+communication mediums.
+
+## 7. Contact info
+
+social@freeradius.org