Create test.md

.github/ISSUE_TEMPLATE/test.md

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+---
+name: Test
+about: Test on Longhorn
+title: "[TEST]"
+labels: area/test
+assignees: ''
+
+---
+**What's the test? Please describe.**
+A clear and concise description of what the test you want to develop.
+
+**Describe the items of the test (DoD, definition of done) you'd like.**
+- [ ] <use check box for each item>
+
+**Additional context**
+Add any other context or screenshots about the test request here.