Added usage examples

* Cleaned up project.json

* Updated README with example on how to deserialize json request body

* Added reference to System.Runtime.Serialization.Json as this would seems a common usage

* Added C# example files to the /Examples directory

examples/dotnet/requestheaders.cs

@@ -0,0 +1,17 @@
+using System;
+using Fission.DotNetCore.Api;
+
+public class FissionFunction
+{
+    public string Execute(FissionContext context){
+        var buffer = new System.Text.StringBuilder();
+        foreach(var header in context.Request.Headers){
+                buffer.AppendLine(header.Key);
+                foreach(var item in header.Value){
+                        buffer.AppendLine($"\t{item}");
+                }
+        }
+        buffer.AppendLine($"Url: {context.Request.Url}, method: {context.Request.Method}");
+        return buffer.ToString();
+    }
+}