Added bug report markdown file.

.github/ISSUE_TEMPLATE/bug-report.md

@@ -0,0 +1,27 @@
+---
+name: Bug report
+about: Create a report to help us improve
+
+---
+
+### Prerequisites
+
+- [ ] I have written a descriptive issue title
+- [ ] I have verified that I am using the latest version of ImageMagick
+- [ ] I have searched [open](https://github.com/ImageMagick/ImageMagick/issues) and [closed](https://github.com/ImageMagick/ImageMagick/issues?q=is%3Aissue+is%3Aclosed) issues to ensure it has not already been reported
+
+### Description
+<!-- A description of the bug or feature -->
+
+### Steps to Reproduce
+<!-- List of steps, sample code, failing test or link to a project that reproduces the behavior.
+     Make sure you place a stack trace inside a code (```) block to avoid linking unrelated issues -->
+
+### System Configuration
+<!-- Tell us about the environment where you are experiencing the bug -->
+
+- ImageMagick version:
+- Environment (Operating system, version and so on):
+- Additional information:
+
+<!-- Thanks for reporting the issue to ImageMagick! -->