Add markdown help #157 #18 #148 #147

[BernieWhite]

PR Summary

• Added rule documentation, which allows additional rule information to be stored in markdown files. Add rule documentation #157
• Rule documentation also adds culture support. Add culture support for rule output #18
• Rule documentation can be access like help with the Get-PSRuleHelp cmdlet.
• Added annotations, which are non-indexed metadata stored in rule documentation. Allow inclusion of non-indexed metadata #148
• Annotations can contain a link to online version of the documentation. Add external reference links #147

Fixes #157
Fixes #18
Fixes #148
Fixes #147

PR Checklist

• PR has a meaningful title
• Summarized changes
• Change is not breaking
• This PR is ready to merge and is not Work in Progress
• Code changes
  • Have unit tests created/ updated
  • Link to a filed issue
  • Change log has been updated with change under unreleased section