Add Infinispan starter reference

Closes gh-7997

Author: slaskawi

spring-boot-starters/README.adoc

@@ -109,4 +109,7 @@ do as they were designed before this was clarified.
 | LDAP
 | https://github.com/eddumelendez/ldap-spring-boot
 
+| http://infinispan.org/[Infinispan]
+| https://github.com/infinispan/infinispan-spring-boot
+
 |===