Document built-in resources

[michaeltlombardi]

Summary of the new feature / enhancement

As a user, I want to be able to review reference documentation for the built-in resources provided with DSC instead of needing to review example configurations, the resource manifests, and GitHub work items to understand how to use those resources.

Proposed technical implementation details (optional)

Draft the documentation for the following resources in the docs/reference folder before syncing to the online documentation:

• Resource reference overview
• DSC.PackageManagement/Apt
• DSC.PackageManagement/Brew
• Microsoft/OSInfo
• Microsoft.DSC/Assertion
• Microsoft.DSC/Group
• Microsoft.DSC/Include
• Microsoft.DSC/PowerShell
• Microsoft.DSC.Debug/Echo
• Microsoft.DSC.Transitional/RunCommandOnSet
• Microsoft.Windows/RebootPending
• Microsoft.Windows.OpenSSH.SSHD/sshd_config
• Microsoft.Windows/WMI
• Microsoft.Windows/WindowsPowerShell

[dummys]

+1

[Gijsreyn]

Hey Mikey Lombardi (He/Him) (@michaeltlombardi). For housekeeping purposes, I think the Microsoft.Windows/WindowsPowerShell, Microsoft.DSC/PowerShell, Microsoft/OSInfo, and Microsoft.Windows/RebootPending can be checked off. For the Microsoft.Windows/WMI, I just hit up a PR #900.

[Gijsreyn]

I think the Microsoft/Process can be removed, as it's not being shipped. Rather, the apt, brew, and sshconfig can be added to the list.

[EmperorArthur]

Related to #1295