Add ModelMapper starter

Author: snicoll

spring-boot-starters/README.adoc

@@ -22,6 +22,9 @@ do as they were designed before this was clarified.
 |===
 | Name | Location
 
+| http://modelmapper.org/[ModelMapper]
+| https://github.com/jmnarloch/modelmapper-spring-boot-starter
+
 | http://secondmarket.github.io/mongeez/[Mongeez]
 | https://github.com/hzpz/mongeez-spring-boot-starter/