compile API README.md (#1056)

src/onediff/infer_compiler/README.md

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+# OneDiff compiler for inference
+
+## With nexfort compiler backend
+### Installation
+1. Install nexfort: https://github.com/siliconflow/onediff?tab=readme-ov-file#nexfort
+2. Install onediff: https://github.com/siliconflow/onediff?tab=readme-ov-file#3-install-onediff
+
+### Usage
+```python
+from onediff.infer_compiler import compile
+
+# module is the model you want to compile
+options = '{"mode": "O3"}'  # mode can be O2 or O3
+compiled = compile(module, backend="nexfort", options=options)
+```
+
+### Suggested Modes
+
+| Combination | Description |
+| - | - |
+| `O2` | This is the most suggested combination of compiler modes. This mode requires support for most models, ensuring model accuracy, and supporting dynamic resolution. |
+| `O3` | This aims for efficiency. |