Update issue templates

Author: tuoping

.github/ISSUE_TEMPLATE/issue--about-input-files.md

@@ -0,0 +1,29 @@
+---
+name: 'Issue: About input files'
+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/deepmd-kit/issues/new/choose).
+title: "[About input files] _Replace With Suitable Title_"
+labels: document
+assignees: ''
+
+---
+
+**Summary**
+
+<!--Please provide a clear and concise description of what question is.-->
+
+**Expected Behavior**
+
+<!--Describe the expected behavior.  Quote from the deepmd-kit manual where needed, or explain why the expected behavior is meaningful, especially when it differs from the manual-->
+
+**Actual Behavior**
+
+<!--Describe the actual behavior, how it differs from the expected behavior, and how this can be observed.  Try to be specific and do **not** use vague terms like "doesn't work" or "wrong result".  Do not assume that the person reading this has any experience with or knowledge of your specific area of research.-->
+
+**The material system in question**
+
+<!--Specify your material system, and exactly what behaviors or properties you are looking for.-->
+
+**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-->