Update README.md

Author: joadan

README.md

@@ -12,15 +12,28 @@
 # Introduction
 Linq2GraphQL generates C# classes from the GraphQL schema and and togheter with the nuget package Linq2GraphQL.Client  it makes it possible to query the server using Linq expressions. 
 
-A simple query that will get the first 10 orders with the primitive properties of orders and the connected customer
+A simple query that will get the first 10 orders with the primitive properties of orders and the connected customer.
 
 	 var orders = await sampleClient
-		.Query
+	.Query
         .Orders(first: 10)
         .Include(e => e.Orders.Select(e => e.Customer))
         .Select(e => e.Orders)
         .ExecuteAsync();
 
+A example mutation where we add a new customer and return the Customer Id.
+
+     var customerId = await sampleClient
+         .Mutation
+         .AddCustomer(new CustomerInput
+         {
+             CustomerId = Guid.NewGuid(),
+             CustomerName = "New Customer",
+             Status = CustomerStatus.Active
+         })
+         .Select(e=> e.CustomerId)
+         .ExecuteAsync();
+     
 
 # Getting Started
 ## Generate Client code