Add azurepipelines

[asvetlov]

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[codecov-io]

Codecov Report

Merging #4157 into master will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4157      +/-   ##
==========================================
- Coverage   97.35%   97.33%   -0.03%     
==========================================
  Files          43       43              
  Lines        8850     8850              
  Branches     1381     1381              
==========================================
- Hits         8616     8614       -2     
- Misses        113      114       +1     
- Partials      121      122       +1

Impacted Files	Coverage Δ
aiohttp/web_fileresponse.py	96.59% <0%> (-1.14%)	⬇️

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