Create Messages

you might want to write a helper method just because you might want to have various settings to prevent people from messaging random people who aren't their friends, etc. also it's a little more direct than "if this user isn't the current user" which doesn't really reflect your intent with this code i think

you could do it as a can_be_messaged?(@user) helper method or you could do the cooler 
```if current_user.can_message?(@user)``` and define it on the user model