docs: public SshKey addSshKey(Integer userId, String title, String key) throws GitLabApiException {
  
          if (userId == null) {
              throw new RuntimeException("userId cannot be null");
          }
  
          GitLabApiForm formData = new GitLabApiForm().withParam("title", title).withParam("key", key);
          Response response = post(Response.Status.CREATED, formData, "users", userId, "keys");
          SshKey sshKey = response.readEntity(SshKey.class);
          if (sshKey != null) {
              sshKey.setUserId(userId);
          }
  
          return (sshKey);
      }