[Docs] Add oriented bounding boxes object detection example (#91)

examples/detection/obb/README.md

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+# Oriented Bounding Boxes Object Detection Example
+
+## Introduction
+
+Oriented object detection surpasses standard object detection by adding angular precision to pinpoint objects in images.
+
+<img src=".data/annotated_obb_task.png" width="100%" />
+
+## Usage
+
+The calibration process for the rotated object detection task is as follows:
+
+- Import the image file.
+- Click the `rotations` button on the left menu bar or press the shortcut key `O` to quickly draw a rotated box.
+- Select the corresponding rotated box object and adjust the rotation angle using the following shortcut keys:
+
+| Shortcut Key | Description                |
+| ------------ | -------------------------- |
+| z            | Rotate counterclockwise by a large angle |
+| x            | Rotate counterclockwise by a small angle |
+| c            | Rotate clockwise by a small angle |
+| v            | Rotate clockwise by a large angle |
+
+To display the rotation degrees, you can click 'View' in the top menu bar, and check 'Show Degrees' to display the estimated rotation angle in real-time.