Add text orientation cls module.

python/rapid_structure/docs/README_Orientation.md

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+## Rapid Orientation
+<p align="left">
+    <a href=""><img src="https://img.shields.io/badge/Python->=3.7,<=3.10-aff.svg"></a>
+    <a href=""><img src="https://img.shields.io/badge/OS-Linux%2C%20Win%2C%20Mac-pink.svg"></a>
+    <a href="https://pypi.org/project/rapid-orientation/"><img alt="PyPI" src="https://img.shields.io/pypi/v/rapid-orientation"></a>
+    <a href="https://pypi.org/project/rapid-orientation/"><img src="https://img.shields.io/pypi/dm/rapid-orientation?color=9cf"></a>
+</p>
+
+#### 简介和说明
+- 该部分主要是做含文字图像方向分类模型。
+
+    | 模型类型  |        模型名称         | 模型大小 |                           支持种类                           |
+    |:---:|:---:|:---:|:---:|
+    |   四方向分类   |   `rapid_orientation.onnx`   |  6.5M | `0 90 180 270`|
+
+#### 使用方式
+1. pip安装
+   - 由于模型较小，已经将分类模型(`rapid_orientation.onnx`)打包进了whl包内：
+        ```bash
+        $ pip install rapid-orientation
+        ```
+2. python脚本运行
+   ```python
+    import cv2
+    from rapid_orientation import RapidOrientation
+
+    orientation_engine = RapidOrientation()
+
+    img = cv2.imread('test_images/layout.png')
+
+    orientation_res, elapse = orientation_engine(img)
+    print(orientation_res)
+   ```
+
+3. 终端运行
+   - 用法:
+     ```bash
+     $ rapid_orientation -h
+     usage: rapid_orientation [-h] -img IMG_PATH [-m MODEL_PATH]
+
+     optional arguments:
+     -h, --help            show this help message and exit
+     -img IMG_PATH, --img_path IMG_PATH
+                           Path to image for layout.
+     -m MODEL_PATH, --model_path MODEL_PATH
+                           The model path used for inference.
+     ```
+   - 示例:
+     ```bash
+     $ rapid_orientation -img test_images/layout.png
+     ```
+
+4. 结果
+    ```python
+    # 返回结果为str类型，有四类：0 | 90 | 180 | 270
+    ```