What is being said in the prologue? what is being foreshadowed? in romeo and juliet?

It is saying that the two houses ({Montague= Romeo} and {Capulet= Juliet}) don't get along, and their feud won't allow the two lovers to be together, so they end up committing suicide to be together in the end. Although, the parents are still mad about their love.

This is the foreshadowing, in my words. I hope it helps.