Add reference to autorest generated csproj

[wyunchi-ms]

Description

Checklist

• I have read the Submitting Changes section of CONTRIBUTING.md
• The title of the PR is clear and informative
• The appropriate ChangeLog.md file(s) has been updated:
  • For any service, the ChangeLog.md file can be found at src/{{SERVICE}}/{{SERVICE}}/ChangeLog.md
  • A snippet outlining the change(s) made in the PR should be written under the ## Upcoming Release header -- no new version header should be added
• The PR does not introduce breaking changes
• If applicable, the changes made in the PR have proper test coverage
• For public API changes to cmdlets:
  • a cmdlet design review was approved for the changes in this repository (Microsoft internal only)
    • {Please put the link here}
  • the markdown help files have been regenerated using the commands listed here

[isra-fel]

I got this build error when building cosmosdb solution in visual studio

Severity	Code	Description	Project	File	Line	Suppression State
Error	NU1105	Unable to find project information for 'C:\Users\yeliu\code\azure-powershell\src\Resources\ResourceManager\ResourceManager.csproj'. If you are using Visual Studio, this may be because the project is unloaded or not part of the current solution so run a restore from the command-line. Otherwise, the project file may be invalid or missing targets required for restore.	Resources	C:\Users\yeliu\code\azure-powershell\src\Resources\Resources\Resources.csproj	1	

Can you double check?