Update issue templates

Author: wang-bin

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,28 @@
+---
+name: Bug report
+about: Report bugs
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Log**
+Add `import 'package:logging/logging.dart';`, add the following lines before `registerWith()`
+```
+  Logger.root.level = Level.ALL;
+  Logger.root.onRecord.listen((record) {
+    print('${record.loggerName}.${record.level.name}: ${record.time}: ${record.message}');
+  });
+```
+and
+```
+Past log here
+```