Create CODE_OF_CONDUCT.md

[marcocuturi]

No description provided.

[codecov-commenter]

Codecov Report

Merging #118 (e96b616) into main (6c5cd31) will increase coverage by 0.03%.
The diff coverage is 89.58%.

@@            Coverage Diff             @@
##             main     #118      +/-   ##
==========================================
+ Coverage   84.35%   84.38%   +0.03%     
==========================================
  Files          42       43       +1     
  Lines        3919     3933      +14     
  Branches      449      448       -1     
==========================================
+ Hits         3306     3319      +13     
- Misses        510      511       +1     
  Partials      103      103              

Impacted Files	Coverage Δ
ott/core/gromov_wasserstein.py	98.09% <ø> (ø)
ott/core/bar_problems.py	50.00% <54.54%> (+1.36%)	⬆️
ott/core/segment.py	74.54% <100.00%> (+1.99%)	⬆️
ott/geometry/grid.py	91.07% <100.00%> (-0.08%)	⬇️
ott/tools/segment_sinkhorn.py	100.00% <100.00%> (ø)
ott/tools/sinkhorn_divergence.py	100.00% <100.00%> (ø)