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Add to #8 writeup how to do a decimating filter and figure out how many multiply & adds are needed for a n/2 decimating low pass filter

A decimating filter is useful when we have too much samples or signals and we need to get rid of some due to the limitations in hardware. We need to get rid of the high frequencies . By inserting zero-valued samples in between the original samples to increase the sampling rate. The number of multiply & adds needed is for every T seconds.