Create ISSUE_TEMPLATE.md

* Suggestion for an issue template to help with the amount of issues

.github/ISSUE_TEMPLATE.md

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+#### Requirements
+
+These items you must provide answers to. 
+
+Make sure to add **all the information needed to understand the bug** so that someone can help:
+
+* Provide the rule id if refering to a specific rule. e.g., `SC1000`
+* Provide **screenshots** where appropriate
+* Sample shell script (wrapped in fenced code)
+
+Please acknowledge that you understand by marking off the following list items below with an 'x'
+
+_--- ✂ snip ✂ --- Delete this line and all of the ^above^ after reading and before submitting your issue please --- ✂ snip ✂ ---_
+
+#### Issue Title
+
+ISSUE TITLE HERE
+
+#### Required Info
+
+- [ ] I have searched the [issues](https://github.com/koalaman/shellcheck/issues) for my issue and found nothing related and/or helpful
+- [ ] I have read or at least glanced at the [Wiki](https://github.com/koalaman/shellcheck/wiki)
+- [ ] What **version** of shellcheck are you using?
+  - hint: `shellcheck --version`
+- [ ] What is your environment/OS ?
+
+#### Optional Info
+
+- [ ] Rule id: [RULE_GOES_HERE](https://github.com/koalaman/shellcheck/wiki/RULE_GOES_HERE)
+- [ ] Screenshot
+- [ ] Sample script
+```sh
+#!/bin/bash
+#...
+```