docs(CONTRIBUTING): create issue template

.github/ISSUE_TEMPLATE.md

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+<!--
+Thank you for raising your concerns, we appreciate your feedback and contributions to this repository.
+
+If your issue is a bug, please follow the format below:
+-->
+
+### pnpm version:
+
+### Code to reproduce the issue:
+
+### Expected behavior:
+
+### Actual behavior:
+
+### Additional information:
+
+ - `node -v` prints:
+ - Windows, OS X, or Linux?: