Added bug report template

Author: gsherwood

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,45 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**Code sample**
+```php
+echo "A short code snippet that can be used to reproduce the bug";
+```
+
+**Custom ruleset**
+```xml
+<?xml version="1.0"?>
+<ruleset name="My Custom Standard">
+  <description>If you are using a custom ruleset, please enter it here.</description>
+</ruleset>
+```
+
+**To reproduce**
+Steps to reproduce the behavior:
+1. Create a file called `test.php` with the code sample above...
+2. Run `phpcs test.php ...`
+3. See error message displayed
+```
+PHPCS output here
+```
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Versions (please complete the following information):**
+ - OS: [e.g., Windows 10, MacOS 10.15]
+ - PHP: [e.g., 7.2, 7.4]
+ - PHPCS: [e.g., 3.5.5, master]
+ - Standard: [e.g., PSR2, PSR12, Squiz]
+
+**Additional context**
+Add any other context about the problem here.