Create SECURITY.md

[daviddias]

No description provided.

[codecov-io]

Codecov Report

Merging #436 into master will decrease coverage by 0.08%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #436      +/-   ##
==========================================
- Coverage   65.66%   65.58%   -0.07%     
==========================================
  Files          48       48              
  Lines        3206     3277      +71     
==========================================
+ Hits         2105     2149      +44     
- Misses        859      877      +18     
- Partials      242      251       +9     

Impacted Files	Coverage Δ
piecestore/impl/piecestore.go	61.18% <0.00%> (+4.04%)	⬆️

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