Update README.md

enhance content being sent

Signed-off-by: Rello <Rello@users.noreply.github.com>

README.md

@@ -4,6 +4,16 @@ Sends anonymized data to Nextcloud to help us to improve Nextcloud. You
 always have full control over the content sent to Nextcloud and can disable
 it again at any time.
 
+### Content being sent:
+- App list (for each app: name, version, enabled status)
+- Database environment (type, version, database size)
+- Encryption information (is it enabled?, what is the default module)
+- Number of shares (per type and permission setting)
+- PHP environment (version, memory limit, max. execution time, max. file size)
+- Server instance details (version, memcache used, status of locking/previews/avatars)
+- Statistic (number of files, users, storages per type, comments and tags)
+
+
 ## QA metrics on master branch:
 
 [![Build Status](https://travis-ci.org/nextcloud/survey_client.svg?branch=master)](https://travis-ci.org/nextcloud/survey_client)