Initial work on frequency method

Project.toml

+[deps]
+DSP = "717857b8-e6f2-59f4-9121-6e50c889abd2"
+DelimitedFiles = "8bb1440f-4735-579b-a4ab-409b98df4dab"
+FFTW = "7a1cc6ca-52ef-59f5-83cd-3a7055c09341"
+FourierTools = "b18b359b-aebc-45ac-a139-9c0ccbb2871e"
+Plots = "91a5bcdd-55d7-5caf-9e0b-520d859cae80"

frequency_power.jl

+using Pkg; Pkg.activate(".");
+using FFTW, DSP, Plots, DelimitedFiles
+
+function plot_spectogram(s, n=div(length(s),8), noverlap=div(n,2))
+	spec = spectrogram(s, n, noverlap)
+	heatmap(spec.time, spec.freq, spec.power)
+end
+
+function read_data(dataname, gyro=false)
+	if !gyro
+		return readdlm("data/$(dataname)_acc.txt", Float64)
+	else
+		return (readdlm("data/$(dataname)_acc.txt", Float64),
+			readdlm("data/$(dataname)_gyr.txt", Float64))
+	end
+end