feat: Added fDragHandle documentation

Author: siarheihuzarevich

public/docs/en/f-drag-handle-directive.md

@@ -0,0 +1,41 @@
+# Drag Handle 
+
+**Selector:** [fDragHandle] 
+
+The **FDragHandle** is a directive that specifies the handle for dragging a node within a flow of elements. It is used in conjunction with the [fNode](f-node-directive) directive to enable dragging functionality.
+
+## Styles
+  - `.f-component` A general class applied to all F components for shared styling.
+
+  - `.f-drag-handle` Class specific to the drag handle directive, providing styles for the drag handle representation.
+
+## Usage
+
+#### Node with drag handle
+
+We need to add the **fDragHandle** directive inside [fNode](f-node-directive) to specify the handle for dragging.
+This can be any element inside the node that will act as the drag handle.
+
+```html
+<f-flow |:|fDraggable|:|>
+  <f-canvas>
+    <div fNode [fNodePosition]="{ x: 100, y: 200 }">
+      <div |:|fDragHandle|:|>Node</div>
+    </div>
+  </f-canvas>
+</f-flow>
+```
+
+#### Disabling Dragging
+
+This code snippet shows how to disable dragging for a node.
+
+```html
+<f-flow fDraggable>
+  <f-canvas>
+    <div fNode |:|[fNodeDraggingDisabled]="true"|:| [fNodePosition]="{ x: 100, y: 200 }">
+      <div fDragHandle>Node</div>
+    </div>
+  </f-canvas>
+</f-flow>
+```