Update README to rename KShingling to Cosine

Author: paulirwin

README.md

@@ -362,19 +362,19 @@ public class Program
         string s2 = "My other string...";
 
         // Let's work with sequences of 2 characters...
-        var ks = new KShingling(2);
+        var cosine = new Cosine(2);
 
         // For cosine similarity I need the profile of strings
-        StringProfile profile1 = ks.GetProfile(s1);
-        StringProfile profile2 = ks.GetProfile(s2);
+        StringProfile profile1 = cosine.GetProfile(s1);
+        StringProfile profile2 = cosine.GetProfile(s2);
 
         // Prints 0.516185
         Console.WriteLine(profile1.CosineSimilarity(profile2));
     }
 }
 ```
 
-Pay attention, this only works if the same KShingling object is used to parse all input strings!
+Pay attention, this only works if the same Cosine object is used to parse all input strings!
 
 
 ### Q-Gram