title: Copy files to the target directory after build
body: <p>Let's assume I have a game with the following directory structure:</p>
  
  <pre><code>/src
  /resources
  Cargo.toml
  </code></pre>
  
  <p>I would like <code>cargo build</code> to copy the files in the <code>resources</code> directory and paste them in the same directory as the executable file.</p>
  
  <p>I know it is possible to do this using a custom build script, but this seems to be a common case that deserves special treatment. So the question is: <strong>does cargo provide a standard way of copying files to the target directory (using just <code>Cargo.toml</code>)?</strong></p>