Add Code of Conduct for applicants and organisers

[ferbsx]

@anikalindtner Does the website itself need a CoC?
The organisers have to link their event CoC, and we will have a CoC for contributions to the website, put on the Readme.
But do we need a CoC for applicants (people applying for events), and organisers.

[alicetragedy]

Hi @ferbsx, I'm just looking through some of the old issues (mainly to make sure that the new issues I've created aren't duplicates). I would say that a CoC for applicants and organisers is not required, as events themselves have a CoC and we have one for the project contributions as well. This said, perhaps it would make sense to make applicants aware of the event's CoC when they apply?
Something along the lines of, “by applying to this event you confirm you've read, understood, and will abide by the event's CoC”?