These libraries are derived from the standard Keyboard library of Arduino and are adding support for Czech (QWERTZ) and Czech (QWERTY) keyboard layout.
The support does not lie in adding characters with Czech diacritic marks, but in allowing to type common non-letter special characters on those keyboards.
Download the CzechKeyboard_QWERTZ.zip or CzechKeyboard_QWERTY.zip file from the latest release. Then use the ZIP import function in Arduino IDE (Sketch > Include Library > Add .ZIP Library...).
The only change from standard Keyboard library is that you have to include #include "CzechKeyboard_QWERTZ.h" or #include "CzechKeyboard_QWERTZ.h" instead of common #include "Keyboard.h". Nothing else is changed.
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