Sun_sensor: add footprint of alignment holes for sensors

modules/Sun_sensor/Sun_shield.pretty/Alignment_hole.kicad_mod

@@ -0,0 +1,18 @@
+(footprint "Alignment_hole" (version 20211014) (generator pcbnew)
+  (layer "F.Cu")
+  (tedit 0)
+  (attr through_hole exclude_from_pos_files exclude_from_bom)
+  (fp_text reference "REF**" (at 0 -2 unlocked) (layer "F.SilkS")
+    (effects (font (size 1 1) (thickness 0.15)))
+    (tstamp fa4317a5-84bf-4bc5-a76e-39c9dc74322a)
+  )
+  (fp_text value "Alignment_hole" (at 0 3.5 unlocked) (layer "F.Fab")
+    (effects (font (size 1 1) (thickness 0.15)))
+    (tstamp 5c6e8499-7ddb-488e-b28a-698103ce6e3c)
+  )
+  (fp_text user "${REFERENCE}" (at 0 5 unlocked) (layer "F.Fab")
+    (effects (font (size 1 1) (thickness 0.15)))
+    (tstamp 15e51ca5-9eb7-44d4-880d-ebea60015cd4)
+  )
+  (pad "" thru_hole circle (at 0 0) (size 1.8 1.8) (drill 1) (layers *.Cu *.Mask) (tstamp b1f6e753-2943-4966-9a1d-84d501867e27))
+)