deegree#1066 update documentation how to retrieve and store schema fi…

…les locally

deegree-services/deegree-webservices-handbook/src/main/asciidoc/featurestores.adoc

@@ -951,7 +951,9 @@ NOTE: If you want to create a relational mapping for an existing GML
 application schema (e.g. INSPIRE Data Themes, GeoSciML, CityGML,
 XPlanung, AAA), always copy the schema files into the _appschemas/_
 directory of your workspace and reference the schema in your
-configuration.
+configuration. You can use tools such as https://github.com/mfalaize/schema-fetcher[schema-fetcher] to retrieve all
+schema files and store them locally. You may need to adjust `include` and `import` elements
+to apply the local file references.
 
 In schema-driven mode, the SQL feature store extracts detailed feature
 type definitions and property declarations from GML application schema