Update CODEOWNERS for DLStreamer project (#101)

Author: tbujewsk

.github/CODEOWNERS

@@ -10,3 +10,6 @@ SECURITY.md @xwu2intel
 /tools/visual-pipeline-and-platform-evaluation-tool/ @dnoliver @rajpatel9498 @mkarvir
 /microservices/dlstreamer-pipeline-server/ @ajagadi1 @rrajore @sajeevrajput
 /microservices/model-registry/ @rrajore @elroyashjr
+/libraries/dl-streamer/ @tbujewsk @msmiatac @OskarFiedot
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