Add issue templates

.gitlab/issue_templates/Bug report.md

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+# My system
+
+- Distribution (name and version):
+- GNOME Shell version:
+- I installed the extension:
+	- [ ] Manually from the repository
+	- [x] From extensions.gnome.org
+	- [ ] From my distribution package manager (or it was preinstalled)
+
+# My problem
+
+## Description of the problem
+
+
+## Steps to reproduce
+
+1.
+
+
+/label ~bug

.gitlab/issue_templates/Suggestion.md

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+
+
+/label ~discussion

.gitlab/issue_templates/Theme request.md

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+- Theme name:
+- Theme repository or download link:
+
+/label ~theme