LGT328P/Timer 3

[beijia4319]

Timer 3 is added to the LGT8F328 comparing with the Atmega328. But the according application about the timer 3 is a rare example. Please add the timer 3 example.thank you very much

[nulllab]

timer3 is not had in office atmega328p, so need add isr vector in avr-gcc toolchain