Update readme

Author: masatoru

README.md

@@ -1,19 +1,21 @@
 # URLSchemeSample
 Sample of URL Scheme for Xamarin.Mac and WPF
 
-### todo
-- implements URL Scheme for Xamarin.Mac <b>*** done ***</b>
+### how to use
+- implements URL Scheme for Xamarin.Mac
 
     Run Xamarin.Mac Application and this command from console
     ```
     open sample-app://Hello
     ```
 
-- implements URL Scheme for WPF <b>*** done ***</b>
+- implements URL Scheme for WPF
 
     Run WPF Application <b>as administrator</b> and this command from command prompt
     ```
     start sample-app://Hello1 Hello2 Hello3
     ```
 
+### todo
+
 - shares with .Net Standard library