Create springbootapplication_annotation_description.adoc

Author: robertmcnees

springbootapplication_annotation_description.adoc

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+Spring Initializr adds the `@SpringBootApplication` annotation to our main class. `@SpringBootApplication` is a convenience annotation that adds all of the following:
+
+- `@Configuration`: Tags the class as a source of bean definitions for the application
+context.
+- `@EnableAutoConfiguration`: Spring Boot attempts to automatically configure your Spring application based on the dependencies that you have added.
+- `@ComponentScan`: Tells Spring to look for other components, configurations, and
+services. If specific packages are not defined, recursive scanning begins with the package of the class that declares the annotation.