ecamp3-logging: add README.md

.helm/ecamp3-logging/README.md

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+# ecamp3-logging
+
+This is a helm chart to deploy the logging stack of ecamp3.
+It uses the EFK stack (Elasticsearch, Filebeat and Kibana).
+There is currently no setup to deploy it in a continuous fashion.\
+The [deploy.sh](deploy.sh) allows to deploy the chart if you have
+a working [kubectl and helm setup](https://github.com/ecamp/ecamp3/wiki/Deployment-installation-Kubernetes#connecting-to-the-cluster).
+
+The current setup of kibana is stored here: [kibana-objects.ndjson](files%2Fkibana%2Fkibana-objects.ndjson)\
+It can be generated and restored with the scripts [dump-kibana-objects.sh](files%2Fkibana%2Fdump-kibana-objects.sh)
+and [restore-kibana-objects.sh](files%2Fkibana%2Frestore-kibana-objects.sh)