[WIP] Add Ascend NPU entry

_additional_platforms/ascend_npu.json

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+{
+  "name": "Ascend NPU",
+  "support_channel": "https://github.com/Ascend/pytorch/issues",
+  "stable": {
+    "linux": "pip3 install torch==2.10.0 --index-url https://download.pytorch.org/whl/cpu && pip3 install torch-npu==2.10.0"
+  }
+}

_get_started/additional_platforms/ascend_npu.md

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+# Installing on Ascend NPU
+
+**Ascend for PyTorch (`TorchNPU`)** is a deep learning adaptation framework built on Ascend. It enables Ascend NPUs to support the PyTorch framework, delivering the powerful computing capabilities of Ascend AI processors to PyTorch developers and users.
+
+## Prerequisites
+
+### Hardware Requirements
+
+* Ascend for PyTorch supports most Ascend platforms. Please check the [hardware compatibility](https://www.hiascend.com/hardware/compatibility) before installing.
+
+### Software Requirements
+
+* Python >= 3.10
+* CANN (Compute Architecture for Neural Networks) toolkit installed >= 8.0
+* Ascend driver and firmware installed
+
+Before installing PyTorch with Ascend NPU support, you must install the CANN toolkit. Download it from the [Ascend Community](https://www.hiascend.com/) and follow the [CANN Installation Guide](https://www.hiascend.com/cann/download?versionId=735&ids=d806%2Ch0501%2Ch0601%2Ch0702).
+
+## Installation
+
+### pip
+
+```bash
+pip3 install torch==2.10.0 --index-url https://download.pytorch.org/whl/cpu && pip3 install torch-npu==2.10.0
+```
+
+Use the pip package manager to install PyTorch with Ascend NPU support. Please refer to the [installation page](https://www.hiascend.com/developer/software/ai-frameworks/pytorch/download?versionId=167&ids=26958bcc909e4cd48fa56d4c4a43ebec%2C98%2C106%2C1%2C6%2C3%2C) and select your preferred options in the selector above to get the installation command.
+
+## Verification
+
+To ensure that PyTorch was installed correctly with Ascend NPU support, run the following code:
+
+```python
+import torch
+import torch_npu
+
+x = torch.randn(2, 2).npu()
+y = torch.randn(2, 2).npu()
+z = x.mm(y)
+
+print(z)
+```
+
+The following similar output indicates successful installation:
+
+```bash
+tensor([[-0.0515,  0.3664],
+        [-0.1258, -0.5425]],  device='npu:0')
+```
+
+## Documentation
+
+For more information, please visit:
+
+* [Ascend for PyTorch Official Documentation](https://www.hiascend.com/document/detail/zh/Pytorch/2600/index/index.html)
+* [Ascend Community Portal](https://www.hiascend.com/)
+* [Ascend/pytorch GitHub Repository](https://github.com/Ascend/pytorch)
+* [PyPI: torch-npu](https://pypi.org/project/torch-npu/)