chore: update pull reqeust template (#369)

Co-authored-by: alex chow <zhouchuanglin@gmail.com>

Author: ArgoZhang

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,45 @@
+# {PR title}
+
+Summary of the changes (Less than 80 chars)
+
+## Description
+
+{Detail}
+
+Fixes #{bug number} (in this specific format)
+
+## Customer Impact
+
+{Justification}
+
+## Regression?
+
+- [ ] Yes
+- [ ] No
+
+[If yes, specify the version the behavior has regressed from]
+
+## Risk
+
+- [ ] High
+- [ ] Medium
+- [ ] Low
+
+[Justify the selection above]
+
+## Verification
+
+- [ ] Manual (required)
+- [ ] Automated
+
+## Packaging changes reviewed?
+
+- [ ] Yes
+- [ ] No
+- [ ] N/A
+
+----
+
+## When servicing release/2.1
+
+- [ ] Make necessary changes in eng/PatchConfig.props