code: def write_file_to_package_zip(self, filename, src_filename):
          
          f = open(src_filename)
          with f:
              data = f.read()
          self.manifest[filename] = md5hash(data)
          self.package_zip.write(src_filename, filename)
docs: Writes a local file in to the zip file and adds it to the manifest
          dictionary
  
          :param filename: The zip file name
  
          :param src_filename: the local file name