added [*.md] section to .editorconfig

[Shinigami92]

• Check the commit's or even all commits' message styles matches our requested structure.
• Check your code additions will fail neither code linting checks nor unit test.

Short description of what this resolves:

If you format Markdown files with, for example, VS code and two spaces are at the end of a line, these spaces have been removed
This no longer happens with the new rules in .editorconfig

I also added final newline to *.md files

Proposed changes:

• add additional rules for *.md files to .editorconfig