Adding notes for 2.5.0 upgrade

2.5.0-upgrade-faq.md

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+## 2.5.0 Course Updates
+
+Really excited to announce amazing updates to the course!
+
+**Great News! We have made significant changes to the REST API section of the course!**
+
+
+## FAQ
+
+#### What are the new changes?
+
+- Updated all code for 2.5.0 RELEASE of Spring Boot
+- Major Changes for REST API:
+ - Rerecorded 10 lectures
+ - Simplified Internationalization
+ - Using spring-data-rest-hal-explorer instead of spring-data-rest-hal-browser
+ - Using Spring Doc Open API instead of Spring Fox Swagger to generate Swagger Docs
+
+
+#### Can I get a link to complete code after the change for REST API?
+
+Here you go - https://github.com/in28minutes/spring-microservices/blob/master/02.restful-web-services/2.5.0-UPGRADE.md
+
+#### Where can I see the diff of changes?
+
+https://github.com/in28minutes/spring-microservices/commit/998e4e8e25a7f46cfce3d562f8c0312f340396fd