Including cosine similarity

[lcgodoy]

Hey, @alexeckert! :smile: Firstly, Congrats for your job in this package! It is amazing! :confetti_ball:

I included the cosine similarity in the package. I followed the pattern of making it a distance.
Also, I added it to the documentation and made the necessary modifications on testMatrixDistances.R. It passed both on testthat verifications, except for the all zeros matrix. Because it implies division by zero. The proyx package deals with it assuming these values equal to zero. :heavy_check_mark:

I hope you appreciate it!

[codecov-io]

Codecov Report

Merging #8 into master will not change coverage. The diff coverage is 100%.

@@          Coverage Diff          @@
##           master     #8   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          12     12           
  Lines         692    697    +5     
=====================================
+ Hits          692    697    +5

Impacted Files	Coverage Δ
src/DistanceDist.h	100% <100%> (ø)	:arrow_up:
src/DistanceFactory.cpp	100% <100%> (ø)	:arrow_up:
R/parDist.R	100% <100%> (ø)	:arrow_up:

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[alexeckert]

@lcgodoy Thanks for your contribution! Except for some minor issues, it looks good:

• You don't need to include src/parallelDist.so, can put it in .gitignore
• Number of distance measures (40) can be updated in DESCRIPTION and Readme to Supports 40 predefined distance measures ...

[lcgodoy]

Nice, @alexeckert! I'll fix it as soon as possible.

[alexeckert]

Thanks, please be aware that the src/parallelDist.so binary is still included.

[lcgodoy]

Sorry, I included it in .gitignore but forgot to delete.