Serverless offer for Azure Cosmos DB now in preview

[This offer](https://aka.ms/cosmos-serverless) provides a lower entry price for NoSQL users and is based on consumption; it bills only for the request units used by database operations with no capacity management required. This offer meets the needs of small-to-medium workloads that don’t require steady throughput, receive requests sporadically or in short bursts, and have moderate performance requirements. Serverless is currently supported on the Azure Cosmos DB Core (SQL) API, while support for the APIs for MongoDB, Gremlin (graph), Table, and Cassandra is coming soon. * Azure Cosmos DB * Features * [ Azure Cosmos DB](https://azure.microsoft.com/en-gb/products/cosmos-db/)