[Enhance] add README and copyright pre-commmit (#1134)

* add precommmit to check readme

* update

* fix typos

mmdet3d/ops/norm.py

+# Copyright (c) OpenMMLab. All rights reserved.
 import torch
 from mmcv.cnn import NORM_LAYERS
 from mmcv.runner import force_fp32

mmdet3d/ops/paconv/__init__.py

+# Copyright (c) OpenMMLab. All rights reserved.
 from .assign_score import assign_score_withk
 from .paconv import PAConv, PAConvCUDA
 

mmdet3d/ops/paconv/assign_score.py

+# Copyright (c) OpenMMLab. All rights reserved.
 from torch.autograd import Function
 
 from . import assign_score_withk_ext

mmdet3d/ops/paconv/paconv.py

+# Copyright (c) OpenMMLab. All rights reserved.
 import copy
 import torch
 from mmcv.cnn import (ConvModule, build_activation_layer, build_norm_layer,

mmdet3d/ops/paconv/utils.py

+# Copyright (c) OpenMMLab. All rights reserved.
 import torch
 
 

mmdet3d/ops/roiaware_pool3d/__init__.py

+# Copyright (c) OpenMMLab. All rights reserved.
 from .points_in_boxes import (points_in_boxes_all, points_in_boxes_cpu,
                               points_in_boxes_part)
 from .roiaware_pool3d import RoIAwarePool3d

mmdet3d/ops/roiaware_pool3d/points_in_boxes.py

+# Copyright (c) OpenMMLab. All rights reserved.
 import torch
 
 from . import roiaware_pool3d_ext

mmdet3d/ops/roiaware_pool3d/roiaware_pool3d.py

+# Copyright (c) OpenMMLab. All rights reserved.
 import mmcv
 import torch
 from torch import nn as nn

mmdet3d/ops/roipoint_pool3d/__init__.py

+# Copyright (c) OpenMMLab. All rights reserved.
 from .roipoint_pool3d import RoIPointPool3d
 
 __all__ = ['RoIPointPool3d']

mmdet3d/ops/roipoint_pool3d/roipoint_pool3d.py

+# Copyright (c) OpenMMLab. All rights reserved.
 from torch import nn as nn
 from torch.autograd import Function
 

mmdet3d/ops/spconv/structure.py

+# Copyright (c) OpenMMLab. All rights reserved.
 import numpy as np
 import torch
 

mmdet3d/ops/voxel/__init__.py

+# Copyright (c) OpenMMLab. All rights reserved.
 from .scatter_points import DynamicScatter, dynamic_scatter
 from .voxelize import Voxelization, voxelization
 

mmdet3d/ops/voxel/scatter_points.py

+# Copyright (c) OpenMMLab. All rights reserved.
 import torch
 from torch import nn
 from torch.autograd import Function