Add .gitattributes

[fezfez]

This will drop downloaded package size drastically

before : 219 items, size 1,3 MB
after : 106 items, size 580,2 kB

[staabm]

Thanks

[codecov]

Codecov Report

Merging #525 (362a448) into master (58f9f9b) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #525   +/-   ##
=========================================
  Coverage     98.67%   98.67%           
  Complexity     1776     1776           
=========================================
  Files            66       66           
  Lines          4304     4304           
=========================================
  Hits           4247     4247           
  Misses           57       57           

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