Update LDAP demo data for multi tenant setups (#168)

* split up ldap demo data for multi tenant setups
* replace pictures with new ones from https://www.pexels.com/search/people/ (free license without the need for attribution)

ldap_demo/README.md

@@ -1,5 +1,12 @@
-# Kopano LDAP demo image
-
-[![](https://images.microbadger.com/badges/image/zokradonh/kopano_ldap_demo.svg)](https://microbadger.com/images/zokradonh/kopano_ldap_demo "Microbadger size/labels") [![](https://images.microbadger.com/badges/version/zokradonh/kopano_ldap_demo.svg)](https://microbadger.com/images/zokradonh/kopano_ldap_demo "Microbadger version")
-
-Image to for an OpenLDAP server to provide some demo users for Kopano. Based on https://github.com/osixia/docker-openldap.
+# Kopano LDAP demo image
+
+[![](https://images.microbadger.com/badges/image/zokradonh/kopano_ldap_demo.svg)](https://microbadger.com/images/zokradonh/kopano_ldap_demo "Microbadger size/labels") [![](https://images.microbadger.com/badges/version/zokradonh/kopano_ldap_demo.svg)](https://microbadger.com/images/zokradonh/kopano_ldap_demo "Microbadger version")
+
+Image to for an OpenLDAP server to provide some demo users for Kopano. Based on https://github.com/osixia/docker-openldap.
+
+The LDAP tree is prepared for both single tenant setups (the default in Kopano) and multi tenant setups. To configure the multi tenant mode (also referred to as "hosted") in `kopano-server` the following values need to be added to `kopano_server.env`:
+
+```
+KCCONF_SERVER_ENABLE_HOSTED_KOPANO=YES
+KCCONF_LDAP_LDAP_COMPANY_TYPE_ATTRIBUTE_VALUE=kopano-company
+```