Skeleton for ThinClientStoreModel and RNTBD serialization#1

nehrao1 merged 2 commits intonehrao1:thinclientStoreModelnehrao1/azure-sdk-for-java:thinclientStoreModelfrom

FabianMeiswinkel:users/fabianm/RntbdSerializationFabianMeiswinkel/azure-sdk-for-java:users/fabianm/RntbdSerializationCopy head branch name to clipboard