Create bug_report.md

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: "[BUG] "
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+
+A clear and concise description of what the bug is.
+
+**Device**
+
+ - Browser [e.g. Chrome ver.22, Safari ver.10]
+ - OS: [e.g. Windows 10]
+ - Screen size [e.g. 800x600]
+
+**To reproduce**
+
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '...'
+3. Scroll down to '...'
+4. See error
+
+**Screenshots**
+
+If applicable, add screenshots to help explain this problem.