Describe Service objects on Code Conventions page
Close parentheses
Comment about forking service objects

@stuart, does this adequately encapsulate your comment toward the bottom of
[this discussion](https://blake-education.hackpad.com/Code-Structure-iOYgkRIEGQF#:h=Comments)?
Service objects resources
Add table of contents to code conventions
First draft of workflow object section
I meant VerbNoun!
return new_class in workflow example
nobody likes explicit returns
Added line about error handling in workflow convention
Merge pull request #6 from blake-education/feature/code_conventions

Code Conventions