Update README.md

Author: codejava-official

README.md

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 Project code for Spring Security HTTP Basic Authentication with in-memory users
 ### Follow our written tutorial here: [Spring Boot Security HTTP Basic Authentication with in-memory users](https://www.codejava.net/frameworks/spring-boot/http-basic-authentication-with-in-memory-users)
 ### Watch coding in action on YouTube: [Spring Boot Security HTTP Basic Authentication with In-Memory Users](https://www.youtube.com/watch?v=d9t_trawaa0)
+## Learn more about Spring framework:
+### [Spring Framework Tutorials](https://www.codejava.net/spring-tutorials)
+### [Spring Boot Tutorials](https://www.codejava.net/spring-boot-tutorials)
+### [Spring Security Tutorials](https://www.codejava.net/spring-security-tutorials)