Write a MATLAB script to generate a $3$D plot of a "Parametric Spiral Helix." The parametric equations for the spiral helix are given by:

x$($t$)=$acos$(2\backslash$pi t$)$

y$($t$)=$asin$(2\backslash$pi t$)$

z$($t$)=$bt

Create a $3$D curve for the spiral helix by varying t in the range $[0,5].$ Assume a$=1$ and b$=0\mathrm{.}2.$ Include labels for the axes and a title for the plot.