Add Nodes/String/Split

Nodes%2FString%2FSplit.md

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+# String Split
+
+---
+
+## 🔌 INPUT PORTS
+
+| Name            | Type            | Description                                                                 |
+|-----------------|-----------------|-----------------------------------------------------------------------------|
+| `Source String` | `System.String` | The original string to split.                                               |
+| `Delimiter`     | `System.String` | The delimiter used to split the string. Only the first occurrence is used.  |
+
+---
+
+## 📤 EXPORT PORTS
+
+| Name                | Type            | Description                                                               |
+|---------------------|-----------------|---------------------------------------------------------------------------|
+| `Before Delimiter`  | `System.String` | The portion of the string before the first occurrence of the delimiter.   |
+| `After Delimiter`   | `System.String` | The portion of the string after the first occurrence of the delimiter.    |
+
+---
+
+## 📝 DESCRIPTION
+
+The **String Split** node splits a string into exactly **two** parts using the **first occurrence** of a specified delimiter.  
+This is useful for parsing commands, filenames, key-value strings, or any text with a predictable divider.
+
+This node is derived from [`BaseImageNode`](../../Nodes/BaseImageNode).
+
+---
+
+## ⚠️ KNOWN ISSUES
+
+- If the delimiter is not found, the full source string is returned in `Before Delimiter` and `After Delimiter` is empty.
+- If the delimiter is null or empty, no split occurs.