Update demo contract

[Tommo-L]

neo-devpack-dotnet/templates/Template.CSharp/Contract1.cs

Lines 6 to 20 in 3ea7af7

	namespace $safeprojectname$
	{
	[ManifestExtra("Author", "Neo")]
	[ManifestExtra("Email", "[email protected]")]
	[ManifestExtra("Description", "This is a contract example")]
	[Features(ContractFeatures.HasStorage)]
	public class Contract1 : SmartContract
	{
	public static bool Main(string operation, object[] args)
	{
	Storage.Put("Hello", "World");
	return true;
	}
	}
	}

• add Verify method and comment
• change Main(string operation, object[] args) to Main()

[devhawk]

Should we also add Update and/or Delete?