Add default issue template

.gitlab/issue_templates/Default.md

@@ -0,0 +1,32 @@
+- [ ] I have searched the issues to make sure I am not opening a duplicate
+- [ ] If this is a jschan installation/setup issue, I have followed the INSTALLATION.md
+- [ ] I am asking a [SMART QUESTION](http://www.catb.org/~esr/faqs/smart-questions.html)
+- [ ] Leave this box unchecked to prove you actually bothered to read
+
+## Issue report
+
+### Description
+A clear and concise description of what the problem is.
+
+### Steps to reproduce (if applicable)
+
+1. Click on '...'
+3. Scroll down to '....'
+4. See error
+
+### Expected result
+What did you expect to happen?
+
+### Actual result
+What actually happened?
+
+### Possible solution
+Optional, if you have a suggestion.
+
+### Additional information
+For example, screenshots and log excerpts.
+
+### Environment
+Device:
+Operating System and version:
+Browser and version: