Add a code of conduct

[blampe]

No description provided.

[codecov]

Codecov Report

Merging #711 into dev will increase coverage by 0.37%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##              dev     #711      +/-   ##
==========================================
+ Coverage   86.68%   87.05%   +0.37%     
==========================================
  Files          40       40              
  Lines        4047     4047              
==========================================
+ Hits         3508     3523      +15     
+ Misses        409      400       -9     
+ Partials      130      124       -6

Impacted Files	Coverage Δ
introspection.go	92.38% <0%> (-3.34%)	⬇️
outbound.go	87.93% <0%> (+1.14%)	⬆️
channel.go	88.06% <0%> (+1.42%)	⬆️
preinit_connection.go	94.16% <0%> (+1.45%)	⬆️
connection.go	81.86% <0%> (+1.76%)	⬆️
mex.go	74.88% <0%> (+2.79%)	⬆️

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