Adding issue template

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a bug report to help us eliminate issues and improve dpdata. If this
+  doesn’t look right, [choose a different type](https://github.com/deepmodeling/dpdata/issues/new/choose).
+title: "[BUG] _Replace With Suitable Title_"
+labels: bug
+assignees: ''
+
+---
+
+**Summary**
+
+<!--Please provide a clear and concise description of what the bug is.-->
+
+<!--Please provide necessary information including the version of software and installation way, input file, running commands, error log , etc., AS  DETAILED AS POSSIBLE to help locate and reproduce your problem. -->
+
+<!--If applicable, specify what platform you are running on. -->
+
+**Steps to Reproduce**
+
+<!--Describe the steps required to (quickly) reproduce the issue. You can attach (small) files to the section below or add URLs where to download an archive with all necessary files. Please try to create an input set that is as minimal and small as possible and reproduces the bug as quickly as possible. **NOTE:** the less effort and time it takes to reproduce your reported bug, the more likely it becomes, that somebody will look into it and fix the problem.-->
+
+**Further Information, Files, and Links**
+
+<!--Put any additional information here, attach relevant text or image files and URLs to external sites, e.g. relevant publications-->

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project. If this doesn’t work right, [choose a different
+  type]( https://github.com/deepmodeling/dpdata/issues/new/choose).
+title: "[Feature Request] _Replace with Title_"
+labels: enhancement
+assignees: ''
+
+---
+
+**Summary**
+
+<!--Please provide a brief and concise description of the suggested feature or change-->
+
+**Detailed Description**
+
+<!--Please explain how you would like to see dpdata enhanced, what feature(s) you are looking for, what specific data format this will support or what specific problems this will solve. If possible, provide references to relevant background information like publications or web pages, and whether you are planning to implement the enhancement yourself or would like to participate in the implementation. If applicable add a reference to an existing bug report or issue that this will address.-->
+
+**Further Information, Files, and Links**
+
+<!--Put any additional information here, attach relevant text or image files and URLs to external sites, e.g. relevant publications-->

.github/ISSUE_TEMPLATE/generic-issue.md

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+---
+name: Generic issue
+about: For issues that do not fit any of the other categories. If this doesn’t work
+  right, [choose a different type]( https://github.com/deepmodeling/dpdata/issues/new/choose).
+title: ''
+labels: wontfix
+assignees: ''
+
+---
+
+**Summary**
+
+<!--Please provide a clear and concise description of what the question is.-->
+
+**Details**
+
+<!--Please explain the issue in detail here-->

.github/ISSUE_TEMPLATE/request-for-help.md

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+---
+name: Request for Help
+about: Don't post help requests here, go to [discussions](https://github.com/deepmodeling/dpdata/discussions)
+  instead. If this doesn’t look right, choose a different type.
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+Before asking questions, you can
+
+search the previous issues or discussions
+check the [README](https://github.com/deepmodeling/dpdata/#readme).
+
+Please **do not** post requests for help (e.g. with installing or using dpdata) here. 
+Instead go to [discussions](https://github.com/deepmodeling/dpdata/discussions).
+
+This issue tracker is for tracking dpdata development related issues only.
+
+Thanks for your cooperation.