code: public static Metadata fromManifest(InputStream is) {
          try {
              Manifest mf = new Manifest(is);
              return fromManifest(mf);
  
          } catch (IOException e) {
              // Problems? Too bad!
          }
          return new Metadata();
      }
docs: Attempts to parse a MANIFEST.MF file from an input stream.
  
  @param is
  An input stream containing the extracted manifest file.
  @return HashMap of the type {atribute name : attribute value}.