* domain-model pattern * fixed optional get before check isPresent * readme minor changes * change currency representation with joda money * changed names of test methods * fixed code smells * Update domain-model/README.md Co-authored-by: Ilkka Seppälä <iluwatar@users.noreply.github.com> * Update domain-model/README.md Co-authored-by: Ilkka Seppälä <iluwatar@users.noreply.github.com> * updated readme and diagrams Co-authored-by: Ilkka Seppälä <iluwatar@users.noreply.github.com>