Add issue template

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a bug report to help us locate problems
+title: ''
+labels: bug
+assignees: ''
+---
+
+## Environment
+Please complete the following information:
+- **OS:** [OS name and version, e.g. Ubuntu 20.10, CentOS 8]
+- **zjunet:** [output of `zjunet -v`, e.g. 0.3.3-3]
+- **xl2tpd:** [output of `xl2tpd -v`, e.g. 1.3.16]
+- **network type:** [wired or wireless or ...]
+- other softwares or the network condition that may related to this bug
+
+## Bug description
+A clear and concise description of what the bug is and how to reproduce it.
+
+## Output
+
+Full output of command line tools.
+
+If applicable, add screenshots to help explain the problem.
+
+```
+[user@host ~]# zjunet XXXX
+...
+```
+
+## Notes
+Add other information that may related to this bug.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,14 @@
+---
+name: Feature request
+about: Suggest a new idea for this project
+title: ''
+labels: feature
+assignees: ''
+---
+
+## Description
+A brief explanation of the feature.
+
+## Motivation
+Why such feature is worthy? What use cases does it support?
+