Feature/sapi

[gbottari]

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [x] I have read the CONTRIBUTING document.
• [x] My code follows the code style of this project.
• [x] My change requires a change to the documentation.
• [x] I have updated the documentation accordingly.
• [x] I have added tests to cover my changes.
• [x] All new and existing tests passed.

This implements the SAPI engine as requested by #4.

[codecov-commenter]

Codecov Report

Merging #11 (761b5d1) into master (01bedfc) will decrease coverage by 2.51%. The diff coverage is 69.04%.

@@            Coverage Diff             @@
##           master      #11      +/-   ##
==========================================
- Coverage   90.79%   88.28%   -2.52%     
==========================================
  Files          27       30       +3     
  Lines         326      367      +41     
==========================================
+ Hits          296      324      +28     
- Misses         30       43      +13     

Impacted Files	Coverage Δ
tts_wrapper/engines/microsoft/client.py	85.71% <ø> (-0.40%)	:arrow_down:
tts_wrapper/engines/sapi/client.py	38.88% <38.88%> (ø)
tts_wrapper/engines/utils.py	86.66% <71.42%> (-13.34%)	:arrow_down:
tts_wrapper/engines/__init__.py	100.00% <100.00%> (ø)
tts_wrapper/engines/sapi/__init__.py	100.00% <100.00%> (ø)
tts_wrapper/engines/sapi/sapi.py	100.00% <100.00%> (ø)

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