Auto add docs issues to project (microsoft#13897)

Author: natke

.github/workflows/add-issues-to-project.yml

@@ -0,0 +1,17 @@
+name: Add documentation issues to docs project
+
+on:
+  issues:
+    types:
+      - opened
+
+jobs:
+  add-to-project:
+    name: Add issue to project
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/[email protected]
+        with:
+          project-url: https://github.com/microsoft/onnxruntime/projects/6
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          labeled: documentation