Update README with a new logo

[koddr]

Hi,

I also updated some README structure and re-draw queue process schema:

[codecov]

Codecov Report

Merging #262 (2369f74) into master (32d3f32) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #262   +/-   ##
=======================================
  Coverage   71.48%   71.48%           
=======================================
  Files          20       20           
  Lines        2202     2202           
=======================================
  Hits         1574     1574           
  Misses        453      453           
  Partials      175      175           

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[hibiken]

This is amazing! Thank you so much :)

I left a few comments, please take a look.
Once the comments have been resolved I'll merge this PR 👍