add cad files for keyboard and case prototype

kicad/leko_pona.kicad_prl

@@ -3,10 +3,12 @@
     "active_layer": 37,
     "active_layer_preset": "Back Layers",
     "auto_track_width": false,
+    "hidden_netclasses": [],
     "hidden_nets": [],
     "high_contrast_mode": 0,
     "net_color_mode": 1,
     "opacity": {
+      "images": 0.6,
       "pads": 1.0,
       "tracks": 1.0,
       "vias": 1.0,
@@ -39,7 +41,6 @@
       11,
       12,
       13,
-      14,
       15,
       16,
       17,
@@ -60,7 +61,9 @@
       33,
       34,
       35,
-      36
+      36,
+      39,
+      40
     ],
     "visible_layers": "0015055_80000000",
     "zone_display_mode": 0