code: public Map<String, Float> getProjectLanguages(Object projectIdOrPath) throws GitLabApiException {
          Response response = get(Response.Status.OK, null, "projects", getProjectIdOrPath(projectIdOrPath), "languages");
          return (response.readEntity(new GenericType<Map<String, Float>>() {}));
      }
docs: Get languages used in a project with percentage value.
  
  <pre><code>GET /projects/:id/languages</code></pre>
  
  @param projectIdOrPath projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance, required
  @return a Map instance with the language as the key and the percentage as the value
  @throws GitLabApiException if any exception occurs
  @since GitLab 10.8