Add github bug report template.

Author: cessen

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,14 @@
+---
+name: Bug report
+about: Report bugs and crashes
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Ropey Version:** full version number (e.g. "2.0.0-alpha-1", not "2")
+
+**Describe the bug**
+
+A description of the bug, including how to reproduce it (if possible).