Add content for spring configuration

src/roadmaps/spring-boot/content/100-spring-core/101-configuration.md

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 # Configuration
+
+Spring Core Configuration is the process of configuring the Spring Framework, which involves specifying the various configuration details required for an application to function properly. This can include setting up beans, specifying bean dependencies, configuring aspect-oriented programming (AOP) aspects, and more. Configuration can be done through Java code, XML files, or using annotations in the code.
+
+You can learn more about Spring Core Configuration from the links below:
+
+- [Spring Framework Documentation](https://docs.spring.io/spring/docs/current/spring-framework-reference/)
+- ["Spring Configuration" tutorial](https://www.baeldung.com/project-configuration-with-spring)
+- ["Spring Framework" tutorial](https://www.tutorialspoint.com/spring/index.htm)
+- ["Spring Core" video tutorial](https://www.youtube.com/watch?v=GB8k2-Egfv0)

src/roadmaps/spring-boot/content/100-spring-core/index.md

@@ -1 +1,10 @@
-# Spring core
+# Spring Core
+
+Spring is an application framework for the Java platform. It provides the infrastructure support for developing Java applications, including dependency injection, data access, transaction management, and more.
+
+You can learn more about Spring Core from the links below:
+
+- [Official website](https://spring.io/)
+- [Official Documentation](https://spring.io/why-spring)
+- [Getting Started with Spring](https://spring.io/guides/gs/spring-boot/)
+- [Spring Core Tutorial](https://www.tutorialspoint.com/spring/index.htm)