Typo in README fixed

Author: alexandercarls

README.md

@@ -1,6 +1,6 @@
 # ![Alt text](web/images/MD4XAML64.png "Material Design In XAML Toolkit") Material Design In XAML Toolkit
 
-Comphrehensive and easy to use Material Design theme and control library for the Windows desktop.
+Comprehensive and easy to use Material Design theme and control library for the Windows desktop.
 
 ![Alt text](web/images/screen-home.png "Material Design Demo")