functions : begin

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begin([optional]);//initialize library

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optional parameters:
begin(); doesn't need any parameters, however it has an optional parameter that should be used only when library initialization occour after another library that already initialized SPI. begin(true); initialize library without perform SPI.init
The complete begin function is: begin([false,true]);
where:
optional: **false **(init SPI and library), **true **(avoid SPI initialization but init library)