## Summary of the Pull Request
Adds a new placeholder {setup_dir} for the setup directory
## PR Checklist
* [x] Applies to work item: #221
* [x] CLA signed. If not, go over [here](https://cla.opensource.microsoft.com/microsoft/onefuzz) and sign the CLI.
* [x] Requires documentation to be updated
* [x] I've discussed this with core contributors already. If not checked, I'm ready to accept this work might be rejected in favor of a different grand plan. Issue number where discussion took place: #xxx
## Info on Pull Request
_What does this include?_
## Validation Steps Performed
_How does someone test & validate?_
