Added issue template (#3025)

* Create ISSUE_TEMPLATE

* Delete ISSUE_TEMPLATE

* Create bug_report.md

* Create new_doc_request.md

* Update and rename bug_report.md to doc_bug_report.md

* Update doc_bug_report.md

.github/ISSUE_TEMPLATE/doc_bug_report.md

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+---
+name: 🐛 Doc Bug Report
+about: If something isn't working as expected.
+
+---
+
+# Doc Bug Report
+
+**This repository is ONLY used to solve issues related to DOCS.**
+
+Please answer the following questions before submitting your issue. Thanks!
+
+1. 请提供出现问题的文档链接。What is the URL of the document related to this issue?
+
+
+2. 请简单描述你期望的文档优化方案和理由。How would you like to improve it and why?
+

.github/ISSUE_TEMPLATE/new_doc_request.md

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+---
+name: "\U0001F680 New Doc Request"
+about: Want to add something new to our doc?
+---
+
+# New Doc Request
+**This repository is ONLY used to solve issues related to DOCS.**
+
+Please answer the following questions before submitting your issue. Thanks!
+
+1. 请提供待写入文档的新功能的背景信息，包括但不限于PRD, PR, 或者 Issue链接。Provide background info about the feature to be documented, such as links to PRD, Pull Request, or Issue.
+
+2. 请提供该新功能可能影响的存量文档的链接。Provide the links of the documents that may be affected by this new feature.
+
+