Add documentation for toolbar (#4907)

src/blenderbim/docs/users/user_interface/toolbar/explore.rst

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+Explore Tool
+============
+
+The Explore Tool is a powerful feature in BlenderBIM that enhances your ability to navigate and inspect IFC models.
+It introduces functionality commonly found in dedicated IFC viewers,
+making BlenderBIM a more comprehensive native IFC authoring and viewing tool.
+
+Shortcut
+--------
+
+:kbd:`Shift` + :kbd:`Spacebar`, :kbd:`5`
+
+Toolbar Icon
+------------
+
+.. figure:: images/toolbar_explore-tool.png
+   :alt: Explore tool icon in the BlenderBIM toolbar
+
+Tool Options
+------------
+
+.. figure:: images/property-editor_explore-tool.png
+   :alt: Explore tool options in the property editor
+
+Key Features
+------------
+
+- **Walk Mode** (Shortcut: :kbd:`Shift` + :kbd:`W`): Navigate through your model in a first-person perspective.
+   - Use :kbd:`W`, :kbd:`A`, :kbd:`S`, :kbd:`D` keys or arrow keys for movement.
+   - Provides a game-like experience for exploring interiors.
+
+- **Add Clipping Plane** (Shortcut: :kbd:`Shift` + :kbd:`C`): Create a cutting plane to view cross-sections of your model.
+   - Drag the plane to adjust its position.
+   - Add multiple clipping planes simultaneously for complex views.
+
+- **Flip Clipping Plane** (Shortcut: :kbd:`Shift` + :kbd:`F`): Reverse the direction of the active clipping plane.
+
+
+Usage
+-----
+
+1. Activate the tool from the toolbar or use the shortcut.
+2. Select the element you want to interact with.
+3. Select the desired option by pressing the corresponding shortcut.
+4. Interact with your model in the 3D viewport:
+
+   * For Walk Mode, use WASD or arrow keys to move through the model.
+   * For Clipping Plane, drag the plane to desired position and use Shift+F to flip if needed.
+
+The Explore Tool significantly enhances the model navigation and inspection capabilities of BlenderBIM.
+It's particularly useful for understanding spatial relationships, inspecting building cross-sections, and navigating through complex interiors.
+These features make BlenderBIM more comparable to dedicated IFC viewers while retaining its powerful authoring capabilities.