springBoot start dependent development process

Defined starting dependent on engineering xxx-spring-boot-starter (starting encapsulates the desired dependence of all other dependent jar package)

	      自动装配工程 xxx-spring-boot-starter-autoconfigure

Create a META-INF / spring.factories file resources directory automatic assembly project xxx-spring-boot-starter-autoconfigure of

	  并在该配置文件中定义自动装配的配置类XxxAutoConfiguration
		例：org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
				com.itheima.redis.config.XxxAutoConfiguration

Write com.itheima.redis.config.XxxAutoConfiguration configuration class