[epub-tts] Add EPUB sample submodules and download entrypoints

README.md

@@ -18,6 +18,18 @@ Recent Python (>=3.11), pip (>=22.3), some sort of virtula environment recommend
 3. Test install running `epub-tts --version`
     - Make sure the venv is activated or that pip installed the package in your PATH
 
+# Sample EPUB download
+
+After cloning with submodules, the repository now includes the EPUB 3 sample collection under `src/vendor/epub3-samples`.
+
+Use the new console entrypoints to export the Moby Dick samples as EPUB files:
+
+- `download-moby-dick` creates `.tmp-samples/moby-dick.epub`
+- `download-moby-dick-media-overlays` creates `.tmp-samples/moby-dick-mo.epub`
+- `download-epub-minimal` creates `.tmp-samples/minimal.epub`
+
+The staging directory `.tmp-samples/` is included in `.gitignore` so generated artifacts stay out of version control.
+
 # 
 
 # Citation