Update README.md

Author: shabbirdwd53

Spring-Boot-Tutorial/README.md

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 - [Spring Boot Tutorial – Bootstrap a Simple Application](http://www.dailycodebuffer.com/spring-boot-tutorial)
 - [Intro to Spring Boot Starters](http://www.dailycodebuffer.com/spring-boot-starters)
+- [Spring Boot Actuator](http://www.dailycodebuffer.com/spring-boot-actuator/)
+- [Create custom Actuator endpoints](http://www.dailycodebuffer.com/create-custom-actuator-endpoints/)
+- [Configure a Spring Boot Web Application](http://www.dailycodebuffer.com/configuring-spring-boot-web-app/)
+- [Guide to @ConfigurationProperties in Spring Boot](http://www.dailycodebuffer.com/configurationproperties-in-spring-boot/)
+- [Automatic Property Expansion with Spring Boot](http://www.dailycodebuffer.com/automatic-property-expansion-with-spring-boot/)
+- [Customize Whitelabel Error Page in Spring Boot](http://www.dailycodebuffer.com/customize-whitelabel-error-page-in-spring-boot/)