[ReleaseNotes] 5.3 ReleaseNotes draft (#943)

Author: MFransen69

ReleaseNotes/ThunderReleaseNotes_R5.3_nanoservices.md

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+# ThunderNanoServices Release Notes R5.3
+
+## introduction
+
+This document describes the new features and changes introduced in ThunderNanoServices R5.3 (compared to the latest R5.2 release).
+
+
+##  Changes and New Features
+
+### Change: Multiple plugins changed for Thunder 5.3
+
+Multiple plugins were changed for Thunder 5.3
+
+### Feature: QA interfaces
+
+Multiple plugins were added in the QA section which can be used for Thunder QA activities.
+
+See [here](https://github.com/rdkcentral/ThunderNanoServices/tree/R5_3/tests) for these plugins.
+
+### Feature: PluginInitializerService 
+
+The plugin PluginInitializerService was added which can be used in case it is desirable to massively activate multiple plugins in parallel.
+This plugin makes sure this will not overfload Thunder with these requests but activates them in a controlled manor.
+
+The plugin can be found [here](https://github.com/rdkcentral/ThunderNanoServices/tree/R5_3/PluginInitializerService)
+
+### Feature: examples
+
+New examples were added [here](https://github.com/rdkcentral/ThunderNanoServices/tree/R5_3/examples) :
+* CustomErrorCode
+* GeneratorShowCase
+