Add Nodes/Image/RGBACombine

Nodes%2FImage%2FRGBACombine.md

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+# RGBA Combine
+
+---
+
+## 🔌 INPUT PORTS
+
+| Name            | Type               | Description                                      |
+|-----------------|--------------------|--------------------------------------------------|
+| `R`               | `SplitChannelData`  | The red channel data to be combined.     |
+| `G`               | `SplitChannelData`  | The green channel data to be combined.   |
+| `B`               | `SplitChannelData`  | The blue channel data to be combined.    |
+| `A`               | `SplitChannelData`  | The alpha channel data to be combined. |
+
+---
+
+## 📤 EXPORT PORTS
+
+| Name            | Type            | Description                                     |
+|-----------------|-----------------|-------------------------------------------------|
+| `Combined Image`  | `ImageData`     | The resulting image after combining the RGBA channels into a single image. |
+
+---
+
+## 📝 DESCRIPTION
+
+The **RGBA Combine** node takes four separate **R**, **G**, **B**, and **A** channels and combines them into a single **RGBA** image. This is commonly used for reconstructing an image from its individual channels, such as when manipulating channels in image processing workflows.
+
+This node:
+- Combines the channels into a single `ImageData` output, using the `Color32` struct for each pixel (each channel is expected to be a `byte` ranging from **0** to **255**).
+
+This node is often combined with an [`RGBASplit`]("Nodes/Image/RGBASplit) Node.
+
+This node is derived from [`BaseImageNode`](Nodes/BaseImageNode).
+
+---
+
+## ⚠️ KNOWN ISSUES
+
+- Ensure that all input channels have the same **width** and **height**. If they do not match, unexpected behavior may occur.
+
+---