Templates for GitHub issues and pull requests

Ported in from Apptainer

Signed-off-by: Jonathon Anderson <janderson@ciq.co>

.github/ISSUE_TEMPLATE.md

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+### Version of Warewulf
+
+What version of Warewulf are you using? Run
+
+`wwctl version`
+
+<!-- please include command-line output in a code block -->
+
+### Expected behavior
+
+What did you expect to see when you do...?
+
+### Actual behavior
+
+What actually happened? Why was it incorrect?
+
+<!-- if this is a feature request, you can ignore this next part -->
+
+### Steps to reproduce this behavior
+
+How can others reproduce this issue/problem?
+
+### What OS/distro are you running
+
+```sh
+$ cat /etc/os-release
+
+```
+
+### How did you install Warewulf
+
+Write here how you installed Warewulf. Eg. RPM, source.

.github/PULL_REQUEST_TEMPLATE.md

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+## Description of the Pull Request (PR):
+
+Write your description of the PR here. Be sure to include as much background,
+and details necessary for the reviewers to understand exactly what this is
+fixing or enhancing.
+
+
+### This fixes or addresses the following GitHub issues:
+
+ - Fixes #
+
+
+#### Before submitting a PR, make sure you have done the following:
+
+- Read the [documentation for contributing to Warewulf](https://warewulf.org/docs/development/contributing/contributing.html)
+- Added changes to the [CHANGELOG](https://github.com/hpcng/warewulf/blob/development/CHANGELOG.md) if necessary
+- Updated [userdocs](https://github.com/hpcng/warewulf/tree/development/userdocs) if necessary
+- Based this PR against the appropriate branch (typically [development](https://github.com/hpcng/warewulf/tree/development/userdocs))
+- Added myself as a contributor to the [Contributors File](https://github.com/hpcng/warewulf/blob/development/CONTRIBUTORS.md