Basic example of use of the functions of modMFRC

Example of 4 operation on TAG:

- Read data block
- Write data block
- write trailer (set owner KeyA)
- format card
Example of using modMFRC (read) with Ethernet module

Simple reading of a block and sending data via UDP broadcast
Example of using modMFRC (write) with Ethernet module

Waiting receive data via UDP broadcast and writing the block on the card