anchor.diff:  
   Quarkus provides `create-extension` Maven Mojo to initialize your extension project.
   
  -[source, shell]
  +[source, shell, subs=attributes+]
   ----
   $ mvn io.quarkus:quarkus-maven-plugin:{quarkus-version}:create-extension -N \
       -DgroupId=org.acme \ #<1>
  
positive.code: 
  Run the application and notice the `Install Features` list contains the `quarkus-greeting` extension.
  
  [source, shell]
  ----
  $ mvn clean compile quarkus:dev
  [INFO] Scanning for projects...
  
negative.code: 
  Time to test!
  
  [source, shell, subs=attributes+]
  ----
  $ mvn clean test
  [INFO] Scanning for projects...
  