Add name version and URL to back silkscreen

Author: ldoolitt

design/Marble.kicad_pcb

@@ -2,7 +2,7 @@
 
   (general
     (thickness 1.6)
-    (drawings 35968)
+    (drawings 35970)
     (tracks 39327)
     (zones 0)
     (modules 931)
@@ -91449,6 +91449,12 @@
   (gr_text "tag: v1.1" (at 199.8 165.1275) (layer F.SilkS) (tstamp 5FC08B71)
     (effects (font (size 1 1) (thickness 0.15)) (justify left))
   )
+  (gr_text "Marble v1.1" (at 286.05 143.35) (layer B.SilkS)
+    (effects (font (size 2 2) (thickness 0.3) italic) (justify mirror))
+  )
+  (gr_text "github.com/BerkeleyLab/Marble\ntag: v1.1" (at 286.05 147.65) (layer B.SilkS)
+    (effects (font (size 1 1) (thickness 0.15)) (justify mirror))
+  )
   (gr_text "FMC 2\nPWR" (at 195.9102 141.0716) (layer F.SilkS) (tstamp 5CD31DEE)
     (effects (font (size 1 1) (thickness 0.15)))
   )