M3 user auth

application/confidentialClient/.gitignore

...ication/confidentialClient/.mvn/wrapper/maven-wrapper.jar

.../confidentialClient/.mvn/wrapper/maven-wrapper.properties

application/confidentialClient/Dockerfile

application/confidentialClient/mvnw

application/confidentialClient/mvnw.cmd

application/confidentialClient/pom.xml

...c/main/java/org/fuseri/confidentialclient/AuthClient.java

...eri/confidentialclient/ConfidentialClientApplication.java

...ion/confidentialClient/src/main/resources/application.yml

...onfidentialclient/ConfidentialClientApplicationTests.java

application/docker-compose.yml

...rg/fuseri/model/dto/certificate/CertificateCreateDto.java

...java/org/fuseri/model/dto/certificate/CertificateDto.java

.../org/fuseri/model/dto/certificate/CertificateFileDto.java

...rg/fuseri/model/dto/certificate/CertificateSimpleDto.java

...ava/org/fuseri/model/dto/course/CourseCertificateDto.java

...ain/java/org/fuseri/model/dto/course/CourseCreateDto.java

...n/java/org/fuseri/model/dto/exercise/AnswerCreateDto.java

...rc/main/java/org/fuseri/model/dto/exercise/AnswerDto.java