Common legend for multiple plots in R

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A simple example of what I was talking about:

m <- matrix(c(1,2,3,4,5,6,7,7,7),nrow = 3,ncol = 3,byrow = TRUE)

layout(mat = m,heights = c(0.4,0.4,0.2))

for (i in 1:6){
    par(mar = c(2,2,1,1))
    plot(runif(5),runif(5),xlab = "",ylab = "")
}


plot(1, type = "n", axes=FALSE, xlab="", ylab="")
plot_colors <- c("blue","black", "green", "orange", "pink")
legend(x = "top",inset = 0,
        legend = c("Fabricated Metal", "Iron and Steel", "Paper","Beverages", "Tobacco"), 
        col=plot_colors, lwd=5, cex=.5, horiz = TRUE)

enter image description here

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