Ability to generate Markdown report

[dgutson]

..so report can be added to a github/gitlab repository (eg README.md and/or set of files).

I know that Asciidoctor output could be converted to markdown with pandoc, but I'm not sure the conversion is optimal. I think it's worth to add a native reporter.

[sschuberth]

Actually, the existing NoticeTemplateReporter should already be capable of doing this: All it does it to take a "templatized" plain text file (which defaults to default.ftl), runs FreeMarker on it to expand the templates, and writes out that file again.

So, if you'd create a custom template that's actually Markdown (plus FreeMarker templates to loop over packages etc.) and specify that via the reporter-specific template.path option, you should get a plain Markdown file in the end.

[dgutson]

@Franco0700 please check this out and contribute the markdown template

[tsteenbe]

Ping @fviernau as we were discussing a MarkDown-based summary ORT result report for the GitHub action for ORT

[fviernau]

FYI: I'm just starting working on a report which can create a short summary of a CI run, e.g. for use with a GitHub action, which would include some template.

[mnonnenmacher]

The NoticeTemplateReporter was renamed to PlainTextTemplateReporter in #6584. This is the recommend way to generate Markdown reports.