Extend gitignore

Exclude (some) oasis artifacts, temp files etc.

Signed-off-by: Christoph Höger <christoph.hoeger@tu-berlin.de>
Add interfaces

Signed-off-by: Christoph Höger <christoph.hoeger@tu-berlin.de>
Simple TODO list

Signed-off-by: Christoph Höger <christoph.hoeger@tu-berlin.de>
atd generation rules

Signed-off-by: Christoph Höger <christoph.hoeger@tu-berlin.de>