add issue templates

add issue templates

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/ISSUE_TEMPLATE/freestyle-issue-template.md

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+---
+name: freestyle issue template
+about: Default issue template
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+<!--
+我们最近调整了 issue 的创建策略，请在创建 issue 前先确认（它）确实是个 issue。
+
+类似以下这些情况可创建 issue: 
+
+  - 明确的 bug
+  - 非预期的结果
+  - 安全风险
+
+
+类似以下这些情况不是 issue，请到 Discussion 区创建讨论： https://github.com/hizzgdev/jsmind/discussions/new?category=general
+
+  - 咨询如何（做到某一功能）
+  - 新的想法
+
+-->