Import Code of Conduct into Community Portal

We want to import the whole content of the code of conduct into the Code of Conduct for Trainers section of the Community Portal.

We want to keep https://gitweb.torproject.org/community/policies.git/tree/code_of_conduct.txt as the source of truth and we need to have this localized.

For soft launch we need to have it localized to spanish (already available here: https://trac.torproject.org/projects/tor/wiki/org/meetings/2018MexicoCity/CodigoDeConducta