chore(ci): add welcome bot for first-time contributors

.github/workflows/welcome.yml

@@ -0,0 +1,30 @@
+name: Welcome
+
+on:
+  issues:
+    types: [opened]
+  pull_request_target:
+    types: [opened]
+
+permissions:
+  issues: write
+  pull-requests: write
+
+jobs:
+  welcome:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/first-interaction@v1
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          issue-message: |
+            Thanks for opening your first issue! We appreciate you taking the time to report this.
+
+            A maintainer will review it soon. In the meantime, please make sure you've included all the relevant details (OS, plugin version, steps to reproduce).
+          pr-message: |
+            Thanks for your first pull request! We're excited to review your contribution.
+
+            Please make sure:
+            - CI checks pass
+            - Your PR title follows [conventional commits](https://www.conventionalcommits.org/) format
+            - You've added tests for new functionality