Add spring-boot-starter-cache

Closes gh-3098

spring-boot-docs/src/main/asciidoc/spring-boot-features.adoc

@@ -2331,6 +2331,9 @@ TIP: It is also possible to {spring-reference}/#cache-annotations-put[update] or
 
 === Supported cache providers
 
+NOTE: To easily get started, just add `spring-boot-starter-cache` to the dependencies of
+your application.
+
 The cache abstraction does not provide an actual store and relies on a abstraction
 materialized by the `org.springframework.cache.Cache` and
 `org.springframework.cache.CacheManager` interfaces. Spring Boot auto-configures a

spring-boot-docs/src/main/asciidoc/using-spring-boot.adoc

@@ -267,6 +267,9 @@ The following application starters are provided by Spring Boot under the
 |`spring-boot-starter-batch`
 |Support for "`Spring Batch`" including HSQLDB database.
 
+|`spring-boot-starter-cache`
+|Support for Spring's Cache abstraction.
+
 |`spring-boot-starter-cloud-connectors`
 |Support for "`Spring Cloud Connectors`" which simplifies connecting to services in cloud
 platforms like Cloud Foundry and Heroku.