.pytool: Add MarkdownLintCheck plugin This plugin runs markdownlint against all markdown files in a given package to report linter errors. See the following readme for me details: .pytool/Plugin/MarkdownLintCheck/Readme.md Co-authored-by: Sean Brogan <sean.brogan@microsoft.com> Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>