Add changelog entry

changelog/unreleased/fix-sharee-substring-search.md

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+Bugfix: Substring search for sharees
+
+We fixed searching for sharees to be no longer case-sensitive. 
+With this we introduced two new settings for the users and groups services:
+"group_substring_filter_type" for the group services and
+"user_substring_filter_type" for the users service.
+They allow to set the type of LDAP filter that is used for substring user
+searches. Possible values are: "initial", "final" and "any" to do either
+prefix, suffix or full substring searches. Both settings default to "initial".
+
+Also a new option "search_min_length" was added for the "frontend" service. It
+allows to configure the minimum number of characters to enter before a search
+for Sharees is started. This setting is e.g. evaluated by the web ui via the
+capabilities endpoint.
+
+https://github.com/owncloud/ocis/issues/547