Add silkscreen for Pico orientation

Signed-off-by: Marc Zyngier <maz@kernel.org>
diff --git a/m1-ubmc.kicad_pcb b/m1-ubmc.kicad_pcb
index d5fdd0f..8971c10 100644
--- a/m1-ubmc.kicad_pcb
+++ b/m1-ubmc.kicad_pcb
@@ -3253,6 +3253,9 @@
   (gr_text "Central Scrutinizer" (at 123.09 49.97 270) (layer "F.SilkS") (tstamp a23d957d-4770-4cb0-b156-7c274c4526d4)
     (effects (font (size 2 2) (thickness 0.2)))
   )
+  (gr_text "/\\ PICO USB /\\" (at 108.87 30.82) (layer "F.SilkS") (tstamp cd14ed00-8f06-48e1-91ec-bb484597dc6b)
+    (effects (font (size 1.2 1) (thickness 0.25)))
+  )
   (gr_text "3.3V" (at 96.5 56.23 90) (layer "F.SilkS") (tstamp fb99a8b4-5a88-40a7-a725-54f415a816bd)
     (effects (font (size 0.5 0.5) (thickness 0.1)))
   )