added pom

git-svn-id: https://localhost:8081/solutions/branches/solution01@3 70e6d95a-685d-4aab-8655-9ba1bc298244
Lösung für Übungsaufgabe 1

git-svn-id: https://localhost:8081/solutions/branches/solution01@5 70e6d95a-685d-4aab-8655-9ba1bc298244
added LineItem

git-svn-id: https://localhost:8081/solutions/branches/solution02@55 70e6d95a-685d-4aab-8655-9ba1bc298244
added invoice and builder

git-svn-id: https://localhost:8081/solutions/branches/solution02@56 70e6d95a-685d-4aab-8655-9ba1bc298244