add description to dscresource struct and tablewriter for list

[SteveL-MSFT]

PR Summary

Create tablewriter to format resource list as table
Added description to dscresource struct and get version/description from manifest

PR Context

Fix #99

[SteveL-MSFT]

@michaeltlombardi this updates the schema for dscresource

[michaeltlombardi]

How does this interact with the --format option on the root command? Is table going to be a new valid option, or is this a special case for dsc resource list? If a user runs the command as dsc --format yaml resource list do they get the old/full output?

[SteveL-MSFT]

--format overrides. table isn't an option since it won't work in other situations.