Update README

README.md

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 [Confluence Doku](https://memobase.atlassian.net/wiki/spaces/TBAS/pages/29295472/Service+Mapper)
 
-[Helm Chart](https://gitlab.switch.ch/memoriav/memobase-2020/services/import-process/mapper-service/-/tree/master/chart)
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+The mapper service is used to map any source data to the Memobase Datamodel. The service uses a mapping configuration
+which can be used to map any source property to a Datamodel object and property.
+
+The mapper can add prefixes to the content and create constant fields in addition to just copying over the 
+source value.
+
+The configuration is added via Kafka topic as configured within the service. 
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