Windows Azure Tables is very lightweight opinion to store, retrieve and queue entities. Fast to setup and very easy to use.
First of all you need to log into Azure management portal and create a new storage or use existing.
Create a new WCF service in Visual Studio 2012. Remember to choose .net 4.0 if you plan to publish it into Windows Azure Websites.
Right click on references and choose manage NuGet packages.
Search for Azure storage and install it.
Now edit IService1.cs and IService1.svc