Adding ISSEU_TEMPLATE.md

ISSUE_TEMPLATE.md

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+Please delete anything that does not apply for you!
+
+## I'm submitting a ...
+  - [ ] bug report
+  - [ ] feature request
+  - [ ] suggestion
+
+## Please tell us about your environment:
+
+  - WordPress Version: 4.9.x
+  - Browser: [ all | Chrome XX | Firefox XX | IE XX | Safari XX | Mobile Chrome XX | Android X.X Web Browser | iOS XX Safari ]
+  - Language: [ all | HTML | S/CSS | ES6 | JSON | NPM ]
+
+
+---
+
+## In case of Bugs
+
+### *Who* is the bug affecting?
+
+### *What* is affected by this bug?
+
+### *When* does this occur?
+
+### *Where* on the platform does it happen?
+
+### *How* do we replicate the issue?
+
+### Expected behavior (i.e. solution)
+
+### Other Comments
+
+---
+
+## In case of Suggestions / Improvements
+
+### For which *Section* would you like to suggest a proposal?
+Please see currently planned/completed sections and their current status in [README.md](https://github.com/Thomas-A-Reinert/WordPress-Developer-Checklist/blob/master/README.md)
+
+### *What* would you like to suggest / improve?
+Please try to find at least two sources that confirm your proposal. Include URLs.
+
+### Are you missing something completely?