docs: added HELP.md

Author: Piotr Kubicki

HELP.md

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+# Read Me First
+The following was discovered as part of building this project:
+
+* The original package name 'com.capgemini.training.appointment-booking-app' is invalid and this project uses 'com.capgemini.training.appointment_booking_app' instead.
+
+# Getting Started
+
+### Reference Documentation
+For further reference, please consider the following sections:
+
+* [Official Apache Maven documentation](https://maven.apache.org/guides/index.html)
+* [Spring Boot Maven Plugin Reference Guide](https://docs.spring.io/spring-boot/3.4.3/maven-plugin)
+* [Create an OCI image](https://docs.spring.io/spring-boot/3.4.3/maven-plugin/build-image.html)
+* [Spring Boot DevTools](https://docs.spring.io/spring-boot/3.4.3/reference/using/devtools.html)
+* [Spring Web](https://docs.spring.io/spring-boot/3.4.3/reference/web/servlet.html)
+* [Spring Security](https://docs.spring.io/spring-boot/3.4.3/reference/web/spring-security.html)
+* [Spring Data JPA](https://docs.spring.io/spring-boot/3.4.3/reference/data/sql.html#data.sql.jpa-and-spring-data)
+* [Spring Boot Actuator](https://docs.spring.io/spring-boot/3.4.3/reference/actuator/index.html)
+* [Flyway Migration](https://docs.spring.io/spring-boot/3.4.3/how-to/data-initialization.html#howto.data-initialization.migration-tool.flyway)
+
+### Guides
+The following guides illustrate how to use some features concretely:
+
+* [Building a RESTful Web Service](https://spring.io/guides/gs/rest-service/)
+* [Serving Web Content with Spring MVC](https://spring.io/guides/gs/serving-web-content/)
+* [Building REST services with Spring](https://spring.io/guides/tutorials/rest/)
+* [Securing a Web Application](https://spring.io/guides/gs/securing-web/)
+* [Spring Boot and OAuth2](https://spring.io/guides/tutorials/spring-boot-oauth2/)
+* [Authenticating a User with LDAP](https://spring.io/guides/gs/authenticating-ldap/)
+* [Accessing Data with JPA](https://spring.io/guides/gs/accessing-data-jpa/)
+* [Building a RESTful Web Service with Spring Boot Actuator](https://spring.io/guides/gs/actuator-service/)
+
+### Maven Parent overrides
+
+Due to Maven's design, elements are inherited from the parent POM to the project POM.
+While most of the inheritance is fine, it also inherits unwanted elements like `<license>` and `<developers>` from the parent.
+To prevent this, the project POM contains empty overrides for these elements.
+If you manually switch to a different parent and actually want the inheritance, you need to remove those overrides.
+