Add bug template

.github/ISSUE_TEMPLATE/bug-report.md

@@ -0,0 +1,45 @@
+---
+name: Bug report (BUG模板)
+about: Create a bug report helping us fix it. (创建一个 BUG 报告以帮助我们进行修复)
+title: "[BUG] Error with something"
+labels: await investigate, bug
+
+---
+
+**Describe the bug**
+<!-- A clear and concise description of what the bug is.
+     请用精炼的语句准确描述你遇到的BUG。-->
+
+**How to reproduce**
+<!-- Please **provide a minimum demo** rather than
+     **a full project or a incomplete pages**.
+     Otherwise, we won't accept your request.
+     请提供一个 **最简单的 demo** 用于复现，而不要提供 **整个项目或者不完整的页面**，
+     否则我们不会受理你的问题。-->
+
+Steps to reproduce the behavior:
+<!-- 描述复现步骤 -->
+
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. Error occurred.
+
+**Expected behavior**
+<!-- A clear and concise description of what you expected to happen.
+     描述你期望的行为。-->
+
+**Screenshots (If contains)**
+<!-- If applicable, add screenshots to help explain your problem.
+     如有相关截图，请提供它们用于解释问题所在。-->
+
+**Version information**
+
+- Device: [e.g. iPhone X]
+- OS: [e.g. iOS 14.7.1]
+- Package Version: [e.g. 2.4.1]
+- Flutter Version: [e.g. v2.5.0]
+
+**Additional context**
+<!-- Add any other context about the problem here.
+     在此提供更多的内容。 -->