Create issue templates

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,30 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug and how to reproduce**
+A clear and concise description of what the faulty behavior is and how it can be triggered.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**What did you do already**
+- Search whether a similar issue is already reported?
+- Check for known workarounds in the issue tracker?
+- Check with guest login?
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Smartphone (please complete the following information):**
+ - Device: [e.g. Pixel XL]
+ - OS: [e.g. Android 8.1 Oreo]
+
+**Additional context**
+Can you give the Site URL for the Piwigo Gallery that you tried to connect to?
+Add any other context about the problem here.