[ReleaseNotes] add 5.2 release notes (#353)

Author: MFransen69

ReleaseNotes/ThunderReleaseNotes_R5.2_rdkservices.md

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+# ThunderNanoServicesRDK Release Notes R5.2
+
+## introduction
+
+This document describes the new features and changes introduced in ThunderNanoServicesRDK R5.2 (compared to the latest R5.1 release).
+
+##  Changes and New Features
+
+### Change: Packager Plugin
+
+Make it work for Thunder 5
+
+### Change: WPEWebKit plugin
+
+Smaller fixes and new features
+
+### Change: Monitor Plugin
+
+Fixed for not restarting a plugin in case it crashed
+
+### Change: SecurityAgent Plugin
+
+The Test mode was repaired 
+
+### Change: Messenger Plugin
+
+Updated for new Thunder 5.1 Tooling features and refcount handling was improved.
+
+
+
+