code: public StatusCode addToWatchList(String sessionId, int accountId, MediaType mediaType, Integer mediaId) throws MovieDbException {
          return tmdbAccount.modifyWatchList(sessionId, accountId, mediaType, mediaId, true);
      }
docs: Add a movie to an accounts watch list.
  
  @param sessionId sessionId
  @param accountId accountId
  @param mediaId mediaId
  @param mediaType mediaType
  @return StatusCode
  @throws MovieDbException exception