Fork with injectable driver (spi, i2c)

[Rotzbua]

Hi,

finally I completed and finished an old version of the library with injectable driver to communicate with mfrc522 board. This is only important for ppl who are using many readers, must use a different spi or have rare boards with custom implementations.

It is an independent fork and not published here to avoid confusion and incompatibilities to existing codes and projects.

Could not test the i2c implementation because my i2c board was broken.

Link to library:

https://github.com/OSSLibraries/Arduino_MFRC522v2

Best and stay healthy.