added homework and atachments

src/lib.rs

@@ -1,11 +1,15 @@
 mod absence;
 mod api_info;
+mod attachment;
 mod error;
 mod events;
+mod homework;
 mod stdtype;
 
 pub use absence::{Absence, AbsenceListItem, SubjectAbsence};
 pub use api_info::ApiInfo;
+pub use attachment::Attachment;
 pub use error::Error;
 pub use events::Events;
+pub use homework::{Homework, HomeworkListItem};
 pub use stdtype::StdType;