chore(readme): naming fixes

README.md

 # DTT example Unittest OpenJDK11 JUnit5 Testrunner
 
-This is the source code repository for the DTT Moodle Plugin.
+This is the source code repository for the DTT example unittest with JUnit5.
 
 Documentation for this is done with GitLab Pages using MkDocs and is available here:  
 [https://transfer.hft-stuttgart.de/pages/dtt/][pages-link]