Edit in JSFiddle

$(".js-data-example-ajax").select2({
  language: {
    noResults: function() {
      return "No results found, <a id='newData' href='#' class='btn btn-xs btn-success'>Use the above text anyways</a>";
    }
  },
  ajax: {
    url: "https://api.github.com/search/repositories",
    dataType: 'json',
    delay: 250,
    type:'GET',
    data: function(params) {
      return {
        q: params.term, // search term
        page: params.page
      };
    },
    processResults: function(data, params) {
      params.page = params.page || 1;

      return {
        results: data.items,
        pagination: {
          more: (params.page * 30) < data.total_count
        }
      };
    },
    cache: true
  },
  escapeMarkup: function(markup) {
    return markup;
  },
  minimumInputLength: 1,
  templateResult: formatRepo,
  templateSelection: formatRepoSelection,
  createTag: function(params) {
    alert('create tag');
    return {
      id: params.term,
      text: params.term,
      newOption: true
    }
  }
});




function formatRepo(repo) {
  if (repo.loading) return repo.text;

  var markup = "<div class='select2-result-repository clearfix'>" +
    "<div class='select2-result-repository__avatar'><img src='" + repo.owner.avatar_url + "' /></div>" +
    "<div class='select2-result-repository__meta'>" +
    "<div class='select2-result-repository__title'>" + repo.full_name + "</div>";

  if (repo.description) {
    markup += "<div class='select2-result-repository__description'>" + repo.description + "</div>";
  }

  markup += "<div class='select2-result-repository__statistics'>" +
    "<div class='select2-result-repository__forks'><i class='fa fa-flash'></i> " + repo.forks_count + " Forks</div>" +
    "<div class='select2-result-repository__stargazers'><i class='fa fa-star'></i> " + repo.stargazers_count + " Stars</div>" +
    "<div class='select2-result-repository__watchers'><i class='fa fa-eye'></i> " + repo.watchers_count + " Watchers</div>" +
    "</div>" +
    "</div></div>";

  if (repo.newOption) {
    alert('adasdasddads');
  }

  return markup;
}

function formatRepoSelection(repo) {
  return repo.full_name || repo.text;
}

<select class="js-data-example-ajax">
  <option value="3620194" selected="selected">select2/select2</option>
</select>

.select2-container {
  width: 100% !important;
}