Add PEP8 style check and add bug report issue template

.github/ISSUE_TEMPLATE/bug-report.md

@@ -0,0 +1,38 @@
+---
+name: "\U0001F41B Bug Report"
+about: Submit a bug report to help us improve Qlib
+labels: bug
+
+---
+
+## 🐛 Bug Description
+
+<!-- A clear and concise description of what the bug is. -->
+
+## To Reproduce
+
+Steps to reproduce the behavior:
+
+1.
+1.
+1.
+
+
+## Expected Behavior
+
+<!-- A clear and concise description of what you expected to happen. -->
+
+## Screenshot
+
+<!-- A screenshot of the error message or anything shouldn't appear-->
+
+## Environment
+
+ - Qlib version:
+ - Python version:
+ - OS (`Windows`, `Linux`, `MacOS`):
+ - Commit number:
+
+## Additional Notes
+
+<!-- Add any other information about the problem here. -->