Setting up Jhipster-Core for Azure Pipelines

[Shaolans]

Overview of the feature request

Since Travis future is now uncertain, we should progressively migrate our CI to Azure Pipelines like we did for the generator or prettier-java.

Motivation for or Use Case

Travis is not doing well.
Azure Pipelines can have up to 10 parallel jobs (5 for Travis)
The sonar is currently broken 0% coverage, this is due to the sonar addon on travis. (It can be easily fixed)

Related issues or PR

I worked on the ci migration and made it worked here but the pipeline needs to be configured beforehand:

• Install sonarcloud extension

• add a service connection for SonarCloud

• [ x] Checking this box is mandatory (this is just to show you read everything)

[pascalgrimaud]

The first thing you can do, is to init a very simple azure-pipelines.yml to this repo.
So it will be easier for me to start to configure Azure.

Similar to: jhipster/prettier-java#199

[pascalgrimaud]

Don't forget to add badge to readme, @Shaolans :)

[Shaolans]

Thanks ! I almost forgot 👍

[Shaolans]

This is not relevant anymore since we migrated to Github Actions