ci: add auto assign action (#14)

Author: capitnflam

.github/workflows/auto-author-assign.yml

@@ -0,0 +1,14 @@
+name: Auto Author Assign
+
+on:
+  pull_request_target:
+    types: [opened, reopened]
+
+permissions:
+  pull-requests: write
+
+jobs:
+  assign-author:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: toshimaru/auto-author-assign@v2.1.0