Added CNC mill and drill project configuration, scripts and examples

examples/CNC_mill_drill_from_gerber/Readme.md

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+## Exporting gcode files from gerber
+
+Adapt milling and drilling parameters in `millproject`:
+```bash
+nano millproject
+```
+
+First, generate gerber files. These are the same used to order from a vendor. There are no specific settings, just:
+
+KiCad PCB Editor → File → Fabrication Outputs → Gerbers
+
+*	Set "Output directory" to "gerbers/"
+*	Select only B.Cu (bottom copper)
+*	Click Plot
+*	Then Generate Drill Files → Generate
+
+Adapt milling and drilling parameters in `millproject`:
+```bash
+nano millproject
+```
+
+Then run:
+
+```bash
+docker run --rm -i -t -v ".:/data" ptodorov/pcb2gcode
+```
+
+The `.ngc` files for milling and drilling will be generated in the `gcode` directory (must exist).
+
+Load the `ngc` file to `gSender` program for the fabrication.