Add dev instructions of how to run the Markdown linter locally

[aevo98765]

I made changes to a MD file and found that the CI pipeline failed because of the Markdown linter. I didn't know how to run this locally on my machine which would make it easier to correct these linting issues.

Acceptance Criteria:

Add instructions of what tool and how to install the Markdown linter locally for devs to run checks before pushing remotely.

[vishnoianil]

@aevo98765 in the makefile, there is a target md-lint that runs the linter locally. That didn't work for you?

[aevo98765]

Hey @vishnoianil, ahh I haven't been using the Makefile in this project. Do we think it is worth having instructions of how to run the MD linter outside of the Makefile or just comment to use the Makefile if you want to run the linting checks... or... just close this issue off as not needed?

[vishnoianil]

@aevo98765 in my opinion, let's stick with makefile as of now, we can always change if that's not working for folks. Having documented it somewhere that dev can use md-lint target to lint the markdown files would be awesome.

[aevo98765]

#75 @vishnoianil