add autp assign workflow

.github/workflows/assign.yml

@@ -0,0 +1,19 @@
+name: Assign
+
+on:
+  pull_request:
+    types: opened
+
+permissions:
+  pull-requests: write
+  repository-projects: read
+
+jobs:
+  assign:
+    name: Assign yourself
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set GitHub assignees
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: gh pr edit ${{ github.event.number }} --add-assignee ${{ github.actor }} --repo ${{ github.repository }}