Update README

Author: kwan3854

Documentation~/Images/GetStringRects.png

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 # **TextMeshProMax**
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 **TextMeshProMax** is a utility library that extends `TextMesh Pro`, making it easier to perform advanced text-related tasks in Unity projects. It supports standard TextMesh Pro functionalities and optional RubyTextMeshPro integration.
 
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 #### 1. GetStringRects
 Retrieve the **Rect information** for specific strings rendered by a `TMP_Text` object.
 
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 - **Parameters**:
   - `text` (`TMP_Text`): The target TextMesh Pro object.
   - `targetString` (`string`): The string you want to locate in the text.