[Feat] Add NPU Backend support for vLLM-Omni (#89)

Signed-off-by: gcanlin <canlinguosdu@gmail.com>

docs/getting_started/installation/npu.md

@@ -1,3 +1,23 @@
-# Ascend-NPU
+# NPU
 
-vLLM-Omni is a Python library that supports the following NPU variants. Select your NPU type to see vendor specific instructions:
+vLLM-Omni supports NPU through the vLLM Ascend Plugin (vllm-ascend). This is a community maintained hardware plugin for running vLLM on NPU.
+
+## Requirements
+
+- OS: Linux
+- Python: 3.12
+
+!!! note
+    vLLM-Omni is currently not natively supported on Windows.
+
+=== "NPU"
+
+    --8<-- "docs/getting_started/installation/npu/npu.inc.md:requirements"
+
+## Installation
+
+### Recommended
+
+=== "NPU"
+
+    --8<-- "docs/getting_started/installation/npu/npu.inc.md:installation"