docs: update RHI API docs

docs/api/rhi/d3d12/device/create-texture.md

@@ -0,0 +1,36 @@
+# D3D12Device::CreateTexture
+
+```cpp
+RHITexture* CreateTexture(const TextureDesc& desc) override;
+```
+
+创建 D3D12 纹理资源。
+
+**参数：**
+- `desc` - 纹理描述符，包含维度、格式、分辨率等
+
+**返回：** 新创建的纹理指针，失败返回 `nullptr`
+
+**复杂度：** O(1)
+
+**示例：**
+
+```cpp
+TextureDesc texDesc;
+texDesc.textureType = (uint32_t)D3D12_RESOURCE_DIMENSION_TEXTURE2D;
+texDesc.width = 1920;
+texDesc.height = 1080;
+texDesc.depth = 1;
+texDesc.mipLevels = 1;
+texDesc.format = (uint32_t)DXGI_FORMAT_R8G8B8A8_UNORM;
+texDesc.sampleCount = 1;
+texDesc.sampleQuality = 0;
+
+RHITexture* texture = device->CreateTexture(texDesc);
+```
+
+## 相关文档
+
+- [D3D12Device 总览](device.md) - 返回类总览
+- [RHIDevice::CreateTexture](../../device/create-texture.md) - 基类方法
+- [D3D12Texture](../../texture/texture.md) - D3D12 纹理实现