Update README.md

Signed-off-by: David Rotermund <54365609+davrot@users.noreply.github.com>
davrot · Nov 16, 2023 · 45ff033 · 45ff033
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 ## Programming Basics: Python Data analysis and more
 [Numpy: rfft and spectral power](numpy_fft_1/README.md)
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+[scipy.signal -- Butterworth low, high and band-pass](scipy.signal_butterworth/README.md)
 
 Note: I will transfer https://www.neurotec.uni-bremen.de/drupal/teaching to this new place (and update it).