title: How to make Vim understand that *.md files contain Markdown code, and not Modula-2 code?
body: <p>When I edit README.md containing Markdown code in Vim and execute <code>:set filetype?</code> command, I see <code>filetype=markdown</code>. The Markdown syntax is highlighted correctly.</p>
  
  <p>But when I edit foo.md containing Markdown code in Vim and execute <code>:set filetype?</code> command, I see <code>filetype=modula2</code>. The Markdown syntax is not highlighted correctly.</p>
  
  <p>What should I add to my ~/.vimrc to make Vim understand that foo.md or any file with extension name as .md is a markdown file and not modula2 file?</p>