add CONTRIBUTING.md

.github/ISSUE_TEMPLATE/question.md

@@ -0,0 +1,27 @@
+---
+name: "Question"
+about: Ask a question about using rust-rpxy
+title: "[Question] "
+labels: question
+assignees: ""
+---
+
+## Your question
+
+Clearly describe your question.
+
+---
+
+## Context
+
+Why are you asking this? Please describe your environment or situation briefly.
+
+---
+
+## Important notes
+
+- Before opening a Question issue, please also consider using **GitHub Discussions** if your question is more open-ended, opinion-based, or community-related.
+- Questions may not always be answered immediately.
+- Please check the documentation and existing issues before opening a new one.
+- This project is maintained on a best-effort basis.
+- This project is primarily driven by the code owner's personal interests, not by commercial demand or contractual obligations.