code: public SshKey addSshKey(String title, String key) throws GitLabApiException {
          GitLabApiForm formData = new GitLabApiForm().withParam("title", title).withParam("key", key);
          Response response = post(Response.Status.CREATED, formData, "user", "keys");
          return (response.readEntity(SshKey.class));
      }
docs: Creates a new key owned by the currently authenticated user.
  
  <pre><code>GitLab Endpoint: POST /user/keys</code></pre>
  
  @param title the new SSH Key's title
  @param key   the new SSH key
  @return an SshKey instance with info on the added SSH key
  @throws GitLabApiException if any exception occurs