Update README.md

README.md

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 1. Load the data
 2. Averaging of the all the channels
 
-% Preprocessing
 3. Detrending filter
 4. Bandpass filter [0.75 2 Hz]
 5. Sliding window technique
 
-% HR estimation
+
 6. Check ground truth file and camera filename same!
 7. Frequency domain - peak frequency for each window
 8. Ground truth HR utilizing STAPE
 
-% Perofrmance metrics
+
 9. Calculate mean absolute error, root mean square error to evaluate the performance