Add NEWS_SENTIMENT api

[viceroypenguin]

No description provided.

[codecov]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (d9dd19e) 78.29% compared to head (a2eba7a) 78.86%.
Report is 1 commits behind head on master.

Files	Patch %	Lines
Source/AlphaVantage.Net/AlphaVantageClient.cs	0.00%	6 Missing ⚠️
Source/AlphaVantage.Net/Converters.cs	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #76      +/-   ##
==========================================
+ Coverage   78.29%   78.86%   +0.56%     
==========================================
  Files          40       43       +3     
  Lines         470      511      +41     
  Branches       27       27              
==========================================
+ Hits          368      403      +35     
- Misses         93       99       +6     
  Partials        9        9              

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