Commit WIP of GitHub issue templates.

.github/CONTRIBUTING.md

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+# iperf3 Contribution Guidelines
+
+Thanks for contributing to iperf3!
+
+This page contains some guidelines for filing issues, pull requests,
+and other sorts of interactions with the iperf3 project.  These are
+guidelines and not hard rules, and it is intended that common sense
+and good judgement will prevail.
+
+
+

.github/ISSUE_TEMPLATE.md

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+_NOTE: The iperf3 issue tracker is for registering bugs, enhancement
+requests, or submissions of code.  It is not a means for asking
+questions about building or using iperf3.  Those are best directed
+towards the iperf3 mailing list at iperf-dev@google-groups.com or
+question sites such as Stack Overflow (http://www.stackoverflow.com/)._
+
+# Context
+
+* Version of iperf:
+
+* Hardware:
+
+* Operating system (and distribution, if any):
+
+_Please note: iperf3 is supported on Linux, FreeBSD, and macOS.
+Support may be provided on a best-effort basis to other UNIX-like
+platforms.  We cannot provide support for building and/or running
+iperf3 on Windows, iOS, or Android._
+
+* Other relevant information (for example, non-default compilers,
+  libraries, cross-compiling, etc.):
+
+# Behavior
+
+* Expected Behavior
+
+* Actual Behavior
+
+* Possible Solution
+
+_Please submit patches or code changes as a pull request._
+
+* Steps to Reproduce (in case of bugs)
+

.github/PULL_REQUEST_TEMPLATE.md

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+_PLEASE NOTE the following text from the iperf3 license.  Submitting a
+pull request to the iperf3 repository constitutes "[making]
+Enhancements available...publicly":_
+
+```You are under no obligation whatsoever to provide any bug fixes, patches, or
+upgrades to the features, functionality or performance of the source code
+("Enhancements") to anyone; however, if you choose to make your Enhancements
+available either publicly, or directly to Lawrence Berkeley National
+Laboratory, without imposing a separate written license agreement for such
+Enhancements, then you hereby grant the following license: a non-exclusive,
+royalty-free perpetual license to install, use, modify, prepare derivative
+works, incorporate into other computer software, distribute, and sublicense
+such enhancements or derivative works thereof, in binary and source code form.
+```
+
+_The complete iperf3 license is available in the `LICENSE` file in the
+top directory of the iperf3 source tree._
+
+* Version of iperf (or development branch, such as `master` or `3.1-STABLE`):
+
+* Issues fixed (if any):
+
+* Brief description of code changes (suitable for use as a commit message):
+