Create bug_report.md

Author: tfSheol

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Report an issue
+about: Create a bug report to fix an existing issue.
+title: ''
+labels: ''
+assignees: ''
+
+---
+By submitting an Issue to this repository, you agree to the terms within the [Code of Conduct](https://github.com/tfSheol/raspberry-pi-cluster-packer/blob/master/CODE-OF-CONDUCT.md).
+
+### Description
+
+> Provide a clear and concise description of the issue, including what you expected to happen.
+
+### Reproduction
+
+> Detail the steps taken to reproduce this error, what was expected, and whether this issue can be reproduced consistently or if it is intermittent.
+>
+> Where applicable, please include:
+>
+> - Code sample to reproduce the issue
+> - Log files (redact/remove sensitive information)
+> - Application settings (redact/remove sensitive information)
+> - Screenshots
+
+### Environment
+
+> Please provide the following:
+
+- **Version of this library used:**
+- **Version of the platform or framework used, if applicable:**
+- **Other relevant versions (language, server software, OS, browser):**
+- **Other modules/plugins/libraries that might be involved:**