[Docs] Add NPU support page (#1876)

* [Docs]Add npu.md and npu_zh.md

* [Fix]Fix readme mdformat

docs/en/device/npu.md

@@ -0,0 +1,29 @@
+# NPU (HUAWEI Ascend)
+
+## Usage
+
+Please refer to the [building documentation of MMCV](https://mmcv.readthedocs.io/en/latest/get_started/build.html#build-mmcv-full-on-ascend-npu-machine) to install MMCV on NPU devices.
+
+Here we use 4 NPUs on your computer to train the model with the following command:
+
+```shell
+bash tools/dist_train.sh configs/textrecog/crnn/crnn_academic_dataset.py 4
+```
+
+Also, you can use only one NPU to train the model with the following command:
+
+```shell
+python tools/train.py configs/textrecog/crnn/crnn_academic_dataset.py
+```
+
+## Models Results
+
+|   Model    | mean_word_acc_ignore_case | mean_word_acc_ignore_case_symbol | Config                                                            | Download                                                             |
+| :--------: | :-----------------------: | :------------------------------: | :---------------------------------------------------------------- | :------------------------------------------------------------------- |
+| [CRNN](<>) |           68.4            |               68.7               | [config](https://github.com/open-mmlab/mmocr/blob/0.x/configs/textrecog/crnn/crnn_academic_dataset.py) | [log](https://download.openmmlab.com/mmocr/textrecog/crnn/crnn_20230406_103202.log.json) |
+
+**Notes:**
+
+- If not specially marked, the results on NPU with amp are the basically same as those on the GPU with FP32.
+
+**All above models are provided by Huawei Ascend group.**

docs/zh_cn/device/npu_zh.md

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+# NPU (华为昇腾)
+
+## 使用方法
+
+首先，请参考[MMCV](https://mmcv.readthedocs.io/zh_CN/latest/get_started/build.html#npu-mmcv-full) 安装带有 NPU 支持的 MMCV。
+使用如下命令，可以利用 4 个 NPU 训练模型（以 CRNN为例）：
+
+```shell
+bash tools/dist_train.sh configs/textrecog/crnn/crnn_academic_dataset.py 4
+```
+
+或者，使用如下命令，在一个 NPU 上训练模型（以 CRNN为例）：
+
+```shell
+python tools/train.py configs/textrecog/crnn/crnn_academic_dataset.py
+```
+
+## 经过验证的模型
+
+|   Model    | mean_word_acc_ignore_case | mean_word_acc_ignore_case_symbol | Config                                                            | Download                                                             |
+| :--------: | :-----------------------: | :------------------------------: | :---------------------------------------------------------------- | :------------------------------------------------------------------- |
+| [CRNN](<>) |           68.4            |               68.7               | [config](https://github.com/open-mmlab/mmocr/blob/0.x/configs/textrecog/crnn/crnn_academic_dataset.py) | [log](https://download.openmmlab.com/mmocr/textrecog/crnn/crnn_20230406_103202.log.json) |
+
+**注意:**
+
+- 如果没有特别标记，NPU 上的结果与使用 FP32 的 GPU 上的结果结果相同。
+
+**以上所有模型权重及训练日志均由华为昇腾团队提供**