chore: update pr template with reminder to add a description (#5062)

* chore: update pr template with reminder to add a description

* chore: update .github/pull_request_template.md

Co-authored-by: Nan Wang <nan.wang@jina.ai>

* chore: update .github/pull_request_template.md

Co-authored-by: Nan Wang <nan.wang@jina.ai>

* chore: update .github/pull_request_template.md

Co-authored-by: Nan Wang <nan.wang@jina.ai>

.github/pull_request_template.md

@@ -1,4 +1,13 @@
-Goals:
+<!---Decomposing the complex issue into subtasks can help you build it step-by-step. Thanks for your pull request! :rocket: --->
+<!---We know that dev life is hectic, but **please provide a (brief) description** of what your PR does, and how it does it. **Otherwise, your PR cannot be reviewed!** --->
+<!---This policy was agreed upon in a past company retro, and makes everyone's life a little easier. Thanks for your collaboration!--->
+
+**Goals:**
+<!---https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue#linking-a-pull-request-to-an-issue-using-a-keyword--->
+
+- resolves #ISSUE-NUMBER
+- ...
+- ...
 
 - ...
 - ...