Include a README file.

Manufactured board are good except plated mounting holes under USB
connector.

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+# USB Serial to RS-485 converter
+
+This project is a board that converts USB serial communications to
+RS-485. An FT232 device is connected to a MAX483 RS-485 transciever
+which allows for a longer distance multidrop communications bus.
+
+The schematic is based on the example shown in the FT232 datasheet.
+
+## Notes
+
+Manufactured by SeeedStudio Aug 2017. Board is fine except the mounting
+holes in the USB micro connector footprint have been plated (they are
+correctly marked as unplated). This allows the shell to short with Vcc
+so it was necessary to lightly drill the holes to disconnect them from
+copper on both top and bottom.