Merge pull request #3722 from RainbowMango/pr_add_cherrypick_template

Add cherry-pick issue template

.github/ISSUE_TEMPLATE/cherry-pick.md

@@ -0,0 +1,42 @@
+---
+name: CherryPick Track
+about: Track tasks when release branches need cherry-pick.
+labels: help wanted
+---
+
+**Which PR needs cherry-picks:**
+<!--
+For example: "PR #1234"
+-->
+PR #
+
+**Which release branches need this patch:**
+<!--
+Karmada now maintains 3 latest releases.
+If a branch doesn't need this cherry-pick, please explain the reason.
+-->
+- [ ] release-1.x 
+- [ ] release-1.y
+- [ ] release-1.z
+
+**How to cherry-pick PRs:**
+
+The `hack/cherry_pick_pull.sh` script can help you initiate a cherry-pick
+automatically, please follow the instructions at [this guideline](https://karmada.io/docs/contributor/cherry-picks). 
+
+The script will send the PR for you, please remember `copy the release notes` from
+the original PR by to the new PR description part.
+
+**How to join or take the task**:
+
+Just reply on the issue with the message `/assign` in a **separate line**.
+
+Then, the issue will be assigned to you.
+
+**Useful References:**
+
+- Release timeline: https://karmada.io/docs/releases
+- How to cherry-pick PRs: https://karmada.io/docs/contributor/cherry-picks
+
+**Anything else we need to know:**
+