Create .add-doc-link.yaml

Author: julia-pfarr

.github/workflows/.add-doc-link.yaml

@@ -0,0 +1,16 @@
+name: Read the Docs PR preview
+on:
+  pull_request_target:
+    types:
+      - opened
+
+permissions:
+  pull-requests: write
+
+jobs:
+  pr-preview-link:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: readthedocs/actions/preview@v1
+        with:
+          project-slug: "bids-website"