Block Editor: Add README for the BlockColorStyleSelector component

packages/block-editor/src/components/color-style-selector/README.md

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+# ColorStyleSelector
+
+The ColorStyleSelector component provides a dropdown interface for selecting text and background colors in the block editor. It renders as a toolbar button that, when clicked, reveals a color selection interface for modifying block styles.
+
+## Usage
+
+```jsx
+import { BlockColorsStyleSelector } from '@wordpress/block-editor';
+import { ColorPalette } from '@wordpress/components';
+
+const MyColorSelectorComponent = () => (
+    <BlockColorsStyleSelector
+        TextColor={TextColorComponent}
+        BackgroundColor={BackgroundColorComponent}
+    >
+        <ColorPalette
+            colors={colors}
+            onChange={(color) => setAttributes({ textColor: color })}
+        />
+    </BlockColorsStyleSelector>
+);
+```
+
+## Props
+
+### TextColor
+
+Text color component that wraps icon.
+
+- Type: `Element`
+- Required: Yes
+
+### BackgroundColor
+
+Background color component that wraps icon.
+
+- Type: `Element`
+- Required: Yes
+
+### children
+
+The content to be displayed within the dropdown panel when the color selector button is clicked.
+
+- Type: `Element`
+- Required: No
+
+### className
+
+Class name for component.
+
+- Type: `string`
+- Required: No