Update README.md

Author: Daniel-Schroeter

README.md

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 # Moodle Plugin "sync_service"
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+! Attention: Until now the Plugin is not working with Moodle 4.2. !
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 This plugin for Moodle (type: local) adds serveral functions to the Moodle Web Service API.
 Those fuctions allow users and external services to remotely create and move new course modules.
 Furthermore an external service (called "Course Sync Extension Service") containing the newly added functions and other core web service functions, which are helpful to use the added functions, is added.