[Feature] Add ECG peak detection by Manikandan (2012)

[DominiqueMakowski]

No description provided.

[codecov-commenter]

Codecov Report

Attention: 60 lines in your changes are missing coverage. Please review.

Comparison is base (d7120b4) 55.01% compared to head (b4a57f2) 54.86%.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #920      +/-   ##
==========================================
- Coverage   55.01%   54.86%   -0.15%     
==========================================
  Files         303      303              
  Lines       14213    14255      +42     
==========================================
+ Hits         7819     7821       +2     
- Misses       6394     6434      +40     

Files	Coverage Δ
neurokit2/ecg/ecg_clean.py	75.60% <100.00%> (ø)
neurokit2/ecg/ecg_peaks.py	80.30% <ø> (ø)
neurokit2/data/read_xdf.py	8.57% <0.00%> (ø)
neurokit2/ecg/ecg_findpeaks.py	65.02% <56.58%> (-4.02%)	⬇️

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