Add Path Workbench Tutorial

[ceremcem]

Compile a straightforward tutorials into one place. Goal:

• Take the 3D model as input
• Produce machine specific G-Code as output.

Steps for this achievement:

• [x] How to create a Path Job (see 1)
• [ ] Define tools (see 5)
• [ ] Create multiple operations (see 2)
• [ ] Create a new post-processor (Fanuc, for example) (see 4)

Resources so far:

1. https://www.freecadweb.org/wiki/Path_Walkthrough_for_the_Impatient#The_Job
2. https://www.youtube.com/watch?v=c4JUnB1AHdY (caution: it seems for FreeCAD 0.16)
3. https://www.youtube.com/watch?v=558lr67m91E
4. https://forum.freecadweb.org/viewtopic.php?t=23127
5. https://www.freecadweb.org/wiki/Path_EditToolsTable

@yrabbit would you suggest a tutorial for these purposes?