Update README

README.md

-## fedora-ingest-service
+## Fedora Ingest Service
 
+This service reads a kafka topic and ingest each message into Fedora. Each message can contain one or several RDF resources which are 
+all created. The service can ingest associated digital files as well.
+
+The service takes care of transformation between local fedora namespaces and the actual namespace used by memobase.
+
+[Confluence Doku](https://ub-basel.atlassian.net/wiki/spaces/MEMOBASE/pages/1891041292/Service+Fedora+Ingest)
+
+### Configuration
+
+- `SFTP_HOST`: The sftp server host name.
+- `SFTP_PORT`: The sftp server port.
+- `SFTP_USER`: The sftp admin user username.
+- `SFTP_PASSWORD`: Password of the admin user.
+- `IS_SIMPLE`: Set to true to use the SimpleIngester.
+- `FEDORA_INTERNAL_BASE_URL`: The base url of the fedora instance. 
+- `FEDORA_EXTERNAL_BASE_URL`: Memobase namespace
+- `FEDORA_USER`: Fedora ingest user username
+- `FEDORA_PASSWORD`: Fedora ingest user password
+- `KAFKA_BOOTSTRAP_SERVERS`: Kafka bootstrap server string.
+- `CLIENT_ID`: Unique id for this service deployment.
+- `TOPIC_IN`: Input topic in Kafka.
+- `TOPIC_OUT`: Not used.
+- `TOPIC_REPORTING`: Topic to send the reports to.