add pull request labeler

.github/workflows/pr-labeler.yml

@@ -0,0 +1,29 @@
+name: Pull Request Labeling
+
+on:
+  - pull_request
+
+jobs:
+  triage:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/labeler@v3
+        with:
+          repo-token: "${{ secrets.GITHUB_TOKEN }}"
+
+  size-label:
+    runs-on: ubuntu-latest
+    steps:
+      - name: size-label
+        uses: "pascalgn/[email protected]"
+        env:
+          GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
+        with:
+          sizes: >
+            {
+              "0": "XS",
+              "50": "S",
+              "100": "M",
+              "250": "L",
+              "500": "Too Large"
+            }