OK, here is an approximation good for fingerpicking while singing.
It is in the key of C, for easy transposition with capo.
A - ve Ma-ri - a,
gra-tia plena.
Ma-ria, gratia ple-na
Ma-ria, gratia plena
Ave, ave dominus,
Dominus Tecum.
Benedicta tu in mulieribus,
Et benedictus
Benedictus fructus ventris tui
Ventris tui, Jesus.
Ave Maria.
(closing)
(higher arpeggio)