Add issue template.

Author: realityforge

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,45 @@
+<!--
+Thanks for your interest in the project. I appreciate bugs filed and PRs submitted!
+Please make sure that you are familiar with and follow the Code of Conduct for
+this project (found in the CODE_OF_CONDUCT.md file).
+
+Please fill out this template with all the relevant information so we can
+understand what's going on and fix the issue.
+
+I may ask you to submit the fix (after giving some direction).
+-->
+
+Environment:
+
+<!--
+  Please provide the version of this project where the issue occurred as well as the
+  versions of other environmental factors. This could be virtual machine version, os
+  version, browser version etc.
+-->
+
+Relevant code or config:
+
+```
+
+```
+
+What you did:
+
+
+
+What happened:
+
+<!-- Please provide the full error message/screenshots/anything -->
+
+Reproduction repository:
+
+<!--
+If possible, please create a repository that reproduces the issue with the
+minimal amount of code possible.
+-->
+
+Problem description:
+
+
+
+Suggested solution: