Code of Conduct Template

Hi all,

As part of the nodeschool/honolulu organization, we created a code of conduct based off of examples on the web.

https://github.com/nodeschool/honolulu/pull/5

@maxogden had mentioned the possibility making it a standard that other organizations can use. So, here it is. Apologies for the delay, @maxogden!

Let me know if there are changes that need to be made. :cake: