Respectively, "I don't like broccoli" and--assuming you mean 'ní' (mind the accent), "not/is not."
Word for word, the sentence translates to something like "Broccoli is not good with me." Irish uses the is/ní maith liom X construction to indicate like or dislike, where X is the thing you do/don't like.
for other pronouns is it also "ní maith + le"?
Yes. You use the prepositional pronouns liom, leat, leis, léi, linn, libh, leo.
- Ní maith liom = I do not like.
- Ní maith leat = You do not like.
- Ní maith leis = He does not like.
- Ní maith léi = She does not like.
- Ní maith linn = We do not like.
- Ní maith libh = You (pl) do not like.
- Ní maith leo = They do not like.