Create ISSUE_TEMPLATE.md

Author: troosan

docs/ISSUE_TEMPLATE.md

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+Issue tracker is **ONLY** used for reporting bugs. NO NEW FEATURE ACCEPTED! Use [stackoverflow](https://stackoverflow.com/questions/tagged/phpword) for supporting issues.
+
+# Expected Behavior
+
+Please describe the behavior you are expecting.
+
+# Current Behavior
+
+What is the current behavior?
+
+# Failure Information
+
+Please help provide information about the failure.
+
+## How to Reproduce
+
+Please provide a code sample that reproduces the issue.
+
+```php
+$phpWord = new \PhpOffice\PhpWord\PhpWord();
+$section = $phpWord->addSection();
+$section->...
+```
+
+## Context
+
+* PHP version:
+* PHPWord version: 0.14