Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+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**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Which version of Fluwx do you use?**
+Tell us the version of your current Fluwx.
+
+**Which device do you run on**
+Tell us the device, like BLA-00 and the OS is Android 10.
+
+**Which Flutter do you use?**
+
+Run `flutter doctor` and paste the output here.