<button ng-click="addSoft()">Add project</button>

$scope.addSoft = function () {
        var fd = new FormData();

            fd.append('data', 'angular+laravel');

        $http.post('path', fd, {
            transformRequest: angular.identity,
            headers: {
                'Content-Type': undefined
            }
        }).success(function (response) {
            console.log(response); // angular+laravel
        });

public function addSoft(Request $request)
    {

        $data = $request->get('data');
        return $data;

    }