Update README.md

README.md

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-# NotNullStrings
+# NotNullStrings
+
+This library conatains a small set of useful C# string extension methods aimed at making string manipulation and handling less painful.
+
+Methods follow the null-object pattern; i.e. the library will return  *empty* strings or arrays rather than null. When null strings are supplied as arguments they will be treated as if empty. E.g. 
+
+```CSharp
+var blank = null.IsBlank() ;  // returns true 
+```