Merge pull request #8 from plesk/atikhonov-tech-readme

Added README.md

Author: alexsibtihon

README.md

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+To add recommendations via Advisor Integration API, you need to add a hook that implements `RecommendationsHookInterface`.
+This interface contains the following methods:
+
+* With the `getRecommendations` method, you add your recommendations with steps. 
+  Steps in Advisor Integration API are similar to buttons that apply recommendations in the Plesk interface.
+  For example, the "Configure the Plesk Firewall" recommendation has the "Activate" step/button that turns on the Plesk Firewall.
+* The `applyStep` method is called by Advisor every time a customer clicks the button in the Plesk interface to apply a recommendation.
+
+For more information, see `src/plib/hooks/Advisor.php`.