Here are some movable fingerings for major add9 chords, shown here as Aadd9. These fingerings are all on groups of four adjacent strings. With all four note chords, it is possible to find three such groups - top four, middle four and bottom four.
Here are some more movable fingerings for major add9 chords. These ones are not on groups of four adjacent strings, but all are commonly used shapes. Some contain doubled notes - usually the root or 5th of the chord.
Although quite a few fingerings are shown here, there are always more possibilities. Memorize the chord formula and then experiment with all possible combinations of the notes to come up with your own fingerings.
A minor add9 chord is created by adding a 9th degree to any minor chord. For example, a Cmadd9 chord contains the notes C, Eb, G and D (1, b3, 5 and 9). The following diagram shows some common open minor add9 chord shapes.