Nomad changes

docs/snippets/rust/plugins/extractor_registration.md

@@ -0,0 +1,11 @@
+```rust title="Rust"
+use kreuzberg::plugins::registry::get_document_extractor_registry;
+use std::sync::Arc;
+
+fn register_custom_extractor() -> kreuzberg::Result<()> {
+    let extractor = Arc::new(CustomJsonExtractor);
+    let registry = get_document_extractor_registry();
+    registry.write().unwrap().register(extractor)?;
+    Ok(())
+}
+```