Add Github templates

.github/issue_template.md

@@ -0,0 +1,21 @@
+**Please, do not create duplicate issues**
+
+
+### Actual behaviour
+
+
+### Expected behaviour
+
+
+### Steps to reproduce
+
+
+### Configuration
+
+- Plugin version:
+- Kanboard version:
+- Database type and version:
+- PHP version:
+- OS:
+- Browser:
+