✨: 新增 github issues 模板

更新文档

.github/ISSUE_TEMPLATE.md

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+## background
+
+- 1.Describe the problem you want to solve
+
+- 2.State the status of the problem
+
+- 3.Reasonable suggestion
+
+## train of thought
+
+Idea describes the general solution idea, including API design, pseudo code, etc
+
+## follow-up
+
+For subsequent editing, attach the corresponding pull request address in the form of ` - [] some task '.