Upload images to public/images folder

Hi everybody, I'm new using Laravel. I want to upload a image into public/images/avatar, so in my index.blade.view I have:

<div class="row" ng-controller="DisciplinesController" ng-init="getList()" ng-submit="create()">
        <div class="col-xs-12">
            <div class="white-box">
                <div class="row">
                    <form id="newDiscipline" name="newDiscipline" ng-submit="create()" enctype="multipart/form-data" ng-init="file = {}">
                        <h4 class="text-success">Registrar disciplina</h4>
                        <div class="form-group col-md-12">
                            <div class="form-group col-md-6">
                                <label>Nombre:</label>
                                <input type="text" ng-model="discipline.name" ng-required="true" class="form-control" />
                            </div>
                            <div class="form-group col-md-6">
                                <label>Archivo</label>
                                <input type="file" name="file" fileread="discipline.file" class="form-control" ng-required="true"
                                       accept=".png, .jpg, .jpeg"/>
                            </div>
                        </div>
                        <div class="col-md-12 text-right">
                            <button class="btn btn-success" ng-disabled="newDiscipline.$invalid">
                                <span class="fa fa-save"></span> Guardar
                            </button>
                        </div>
                    </form>
                    <h4 class="text-success">Disciplinas registradas</h4>
                    <table class="table">
                        <thead>
                        <tr>
                            <th>Nombre</th>
                            <th>Acción</th>
                        </tr>
                        </thead>
                        <tbody>
                        <tr ng-repeat="discipline in disciplines">
                            <td>[[ discipline.name ]]</td>
                            <td>
                                <small>
                                    <button class="btn btn-xs btn-danger" ng-click="remove(discipline.id)">
                                        <span class="fa fa-trash"></span> Eliminar Disciplina
                                    </button>
                                </small>
                            </td>
                        </tr>
                        </tbody>
                    </table>
                </div>
            </div>
        </div>
    </div>

And in my PHP Controller I have:

    public function create(Request $request)
    {
        $name = $request->get('name');
        $exists = Disciplines::where('name', $name)->first();
    if(empty($exists))
        {
            $discipline = new Disciplines();
            $discipline->name = $name;
            $discipline->save();

            $file = $request->file('file');
            Storage::disk('local')->put("".$discipline->id."png", file_get_contents($request->file('file')->getRealPath()));
            return response()->json($discipline)->setStatusCode(201);
        }
    }

But when I try to save the image appears that $file is null.

Can anyone help me? Thank you.