Install optional extras

Install optional extras#

This is not required for the half day workshop but some of the more advanced tasks do benefit from having Paraview and or FreeCAD installed.

Some tasks require the use of Paraview to view the 3D meshes produced. Parview can be downloaded from here.
Expand - Ubuntu terminal commands for Paraview install
```
     sudo apt update && sudo apt-get install paraview
     
```
Some tasks require the use of CAD software to view the 3D geometry produced. FreeCAD is one option for this and can be downloaded here.
Expand - Ubuntu terminal commands for FreeCAD install
```
         sudo apt update && sudo apt-get install freecad
         
```