Added ownership section and new exercises

Merge Request Overview

This merge request adds ownership section and replaces the exercises

Testing Strategy

This merge request was tested by Andrei Batasev

TODO or Help Wanted

This merge request still needs... Exercises for ownership and borrowing for home

Build

• Ran ./build.sh.

Author

Signed-off-by: Andrei Batasev andrei.batasev@stud.acs.upb.ro