add issue config

Author: leofang

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,5 @@
+blank_issues_enabled: true
+contact_links:
+  - name: Questions
+    url: https://github.com/NVIDIA/cuda-python/discussions
+    about: Check out our Discussions page to ask and answer questions.