created PreparationNote, with working Create and Update methods.

opp/core/src/main/java/PreparationNote.java

opp/core/src/main/java/PreparationNoteCommand.java

opp/core/src/main/java/PreparationNoteImpl.java

opp/core/src/main/java/PreparationNoteService.java

opp/core/src/main/java/Repository.java

opp/jdbc-repo-impl/src/main/java/JDBCRepository.java

opp/jdbc-repo-impl/src/test/java/Tests.java