Add issue templates

Author: t-paul

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,31 @@
+---
+name: Bug report
+about: Repport an issue with the OpenSCAD Website
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the issue is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to URL '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen or see.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**WebBrowser (please complete the following information):**
+ - Browser [e.g. firefox, chrome, safari]
+ - Version [e.g. 128]
+
+**Additional context**
+Add any other context about the problem here.