Creates AddResourceService & ValidateResourceService

What does this MR do and why?

Creates Ci::Catalog::AddResourceService, which takes in an input (project) and runs some checks through a Ci::Catalog::ValidateResourceService.

Checks:

• Ensure that the project has a non-empty README.md file in the root directory (on default_branch).
• Ensure that the project has a description.

#387064 (closed)

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.