Import stuff from Erlang.SE

[elbrujohalcon]

Take a look at Erlang.SE (i.e. the programming guidelines for Erlang at Ericsson) and extract as many guidelines as possible for this repo.

[paulo-ferraz-oliveira]

Erlang.SE is dead. A (currently functioning) alternative: https://docs.jj1bdx.tokyo/Erlang_Programming_Rules.html