Update issue templates

.github/ISSUE_TEMPLATE/bug-report.md

@@ -0,0 +1,24 @@
+---
+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.
+
+**To Reproduce**
+Please provide a small script to reproduce the behavior:
+```
+codes to reproduce the bug
+```
+Please let me know your OS, Python version, PyTorch version.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.