Add initial PCB design

pcb/.gitignore

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+# For PCBs designed using KiCad: https://www.kicad.org/
+# Format documentation: https://kicad.org/help/file-formats/
+
+# Temporary files
+*.000
+*.bak
+*.bck
+*.kicad_pcb-bak
+*.kicad_sch-bak
+*-backups
+*.kicad_prl
+*.sch-bak
+*~
+_autosave-*
+*.tmp
+*-save.pro
+*-save.kicad_pcb
+fp-info-cache
+~*.lck
+\#auto_saved_files#
+
+# Netlist files (exported from Eeschema)
+*.net
+
+# Autorouter files (exported from Pcbnew)
+*.dsn
+*.ses
+
+# Exported BOM files
+*.xml
+*.csv

pcb/README.md

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+# SplitFlap PCB
+
+This project contains a PCB design (made in KiCad) for the SplitFlap
+display.  The PCB is designed to support a single display and to connect
+to the ESP32 or the next board using JST connectors.
+
+Note that the PCB design is still in development and was designed by
+someone without any prior experience in PCB design.  Any improvements or
+feedback is welcome.