Add .circleci/config.yml

[LexSav7]

No description provided.

[Griesba]

CircleCI 2.1 is not building on Java11

Error stack:
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.1:compile (default-compile) on project pet-clinic-data: Fatal error compiling: invalid target release: 11 -> [Help 1]

[ERROR]

[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.

[ERROR] Re-run Maven using the -X switch to enable full debug logging.

[ERROR]

[ERROR] For more information about the errors and possible solutions, please read the following articles:

[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException

[ERROR]

[ERROR] After correcting the problems, you can resume the build with the command

[ERROR] mvn -rf :pet-clinic-data

[Griesba]

And I noticed that your CircleCI config file is 2 and not 2.1
https://app.circleci.com/pipelines/github/LexSav7/sfg-pet-clinic/7/config