The key is D Major (obviously) and the bassline goes like: D A B F# G D G A. So the 
tab would be this:

G|--------------------------|
D|--0--------------0--------|
A|-----0--2--------------0--|
E|-----------2--3-----3-----|

Play the same bassline till the end of the song and you're done!

Also, the tempo is 98 bpm with half notes.