add references

Author: tienbku

README.md

@@ -1,8 +1,11 @@
 # Spring Boot JPA MySQL - Building Rest CRUD API example
 
 For more detail, please visit:
-> [Spring Boot JPA - Building Rest CRUD API example](https://bezkoder.com/spring-boot-jpa-crud-rest-api/)
+> [Spring Boot JPA + MySQL - Building Rest CRUD API example](https://bezkoder.com/spring-boot-jpa-crud-rest-api/)
 
+> [Spring Boot JPA + PostgreSQL - Building Rest CRUD API example](https://bezkoder.com/spring-boot-postgresql-example/)
+
+More Practice:
 > [Spring Boot Pagination & Filter example | Spring JPA, Pageable](https://bezkoder.com/spring-boot-pagination-filter-jpa-pageable/)
 
 > [Spring Data JPA Sort/Order by multiple Columns | Spring Boot](https://bezkoder.com/spring-data-sort-multiple-columns/)
@@ -14,9 +17,13 @@ For more detail, please visit:
 Fullstack:
 > [Vue.js + Spring Boot + MySQL/PostgreSQL example](https://bezkoder.com/spring-boot-vue-js-crud-example/)
 
-> [Angular + Spring Boot + MySQL/PostgreSQL example](https://bezkoder.com/angular-10-spring-boot-crud/)
+> [Angular + Spring Boot + MySQL example](https://bezkoder.com/angular-10-spring-boot-crud/)
+
+> [Angular + Spring Boot + PostgreSQL example](https://bezkoder.com/angular-10-spring-boot-postgresql/)
+
+> [React + Spring Boot + MySQL example](https://bezkoder.com/react-spring-boot-crud/)
 
-> [React + Spring Boot + MySQL/PostgreSQL example](https://bezkoder.com/react-spring-boot-crud/)
+> [React + Spring Boot + PostgreSQL example](https://bezkoder.com/spring-boot-react-postgresql/)
 
 ## Run Spring Boot application
 ```