Add parametrix NPTH footprint

ergogen/footprints/screw_hole.js

@@ -0,0 +1,15 @@
+module.exports = {
+  params: {
+      designator: 'H', // for Hole
+      size: '2.2',  // Default to M2
+      drill: '2.2'
+  },
+  body: p => `
+  (module Screw_Hole (layer F.Cu) (tedit 5F1B9159) (tstamp 61905781)
+      ${p.at /* parametric position */}
+      (fp_text reference "${p.ref}" (at 0 2.55) (layer F.SilkS) ${p.ref_hide} (effects (font (size 1 1) (thickness 0.15))))
+      (fp_text value "Screw hole (NPTH)" (at 0 -0.5) (layer F.Fab) (effects (font (size 1 1) (thickness 0.15))))
+      (pad "" np_thru_hole circle (at 0 0) (size ${p.size} ${p.size}) (drill ${p.drill}) (layers *.Cu *.Mask))
+  )
+  `
+}