Improve table to describe backend properties

[Robbepop]

Closes #75.

• Uses emojies instead of text in table.
• Explanation of properties put into table.
• Added more properties to explain differences and similarities between backends.

New Render

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.44%. Comparing base (30e910e) to head (23796f8).
Report is 1 commits behind head on master.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master      #84   +/-   ##
=======================================
  Coverage   60.44%   60.44%           
=======================================
  Files          11       11           
  Lines         498      498           
=======================================
  Hits          301      301           
  Misses        197      197           

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