Write small summary of molecules

[MKoesters]

• write csv with all molecules from peak_properties and the specified attributes
• addresses Feature: Output csv file with simulated molecules #23

[codecov]

Codecov Report

Merging #28 into dev will decrease coverage by 0.12%.
The diff coverage is 87.50%.

@@            Coverage Diff             @@
##              dev      #28      +/-   ##
==========================================
- Coverage   99.59%   99.47%   -0.13%     
==========================================
  Files          16       16              
  Lines         749      756       +7     
==========================================
+ Hits          746      752       +6     
- Misses          3        4       +1     

Impacted Files	Coverage Δ
smiter/lib.py	97.77% <ø> (ø)
smiter/synthetic_mzml.py	98.45% <87.50%> (-0.48%)	⬇️

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