Added EpoCAT FR4000

[abausano]

EpoCAT FR4000. EpoCAT FR4000 is a control board for axes in frequency/burst. The board is compatible with EtherCAT protocol. With a maximum output frequency up to 4MHz, it is ideal for applications with step motors, and applications with burst piloted brushless motors. The board manages up to 5 axes in frequency, 4 inputs, 2 outputs, 1 DAC of 12 bit and 2 ADC of 12 bit. The board is supplied with all connectors and can be installed on DIN guide. Since it is a compatible slave EtherCAT board, it is possible to use it with LinuxCNC.

[scottlaird]

Merged in github.com/linuxcnc-ethercat/linuxcnc-ethercat. I'll leave this open here; feel free to close or not.