Add an initial start at another encoder board

Not quite finished, because we ended up not needing this for now, but
should be a useful starting point in the future still.

Change-Id: Ie5f346530e08f943d6b6dd41d4565adb55223235
diff --git a/motors/encoder_schematic/commutation.gsch2pcb b/motors/encoder_schematic/commutation.gsch2pcb
new file mode 100644
index 0000000..7a87246
--- /dev/null
+++ b/motors/encoder_schematic/commutation.gsch2pcb
@@ -0,0 +1,3 @@
+schematics commutation-main.sch
+output-name commutation
+use-files