Change structure of all all sources of exercises to src/main/java

[neomatrix369]

Paris.Apostolopoulos - [email protected] @javapapo [JDK version not provided]

(For the session/ examples), please package the examples on a standard naming convention/ structure, which eventually can be picked up early releases of IDE’s. For example ‘src/main//packages> rather src/module/packages’ +2

Mani: we will attend to this asap