Add brushit documentation and pictures

Author: OneLiteFeather

i18n/en/docusaurus-plugin-content-docs/version-1.5.0/Features/BrushItHeightMapMenu.png

@@ -11,8 +11,16 @@ Add in the list `features` in the section `volans` the string `"BrushIt"`.
 See [here](/docs/Permissions/#brushit)
 ### Utilisation
 1. With the setup item (default stick), left-click in the air.
-2. WIP
+2. You will see the menu on the first picture of this documentation. Hover over the items (for example the paper) to get more information.
+3. If you right-click on the paper item, you can enable/disable the brush
+4. Left click allows you to open a different menu to select a different heightmap to brush. Another left click changes the brush to the selected heightmap.
+5. If you clicked on the heightmap, the menu is closed, you can reopen the main menu with left-click in the air again
+6. There are multiple parameters to change next to the paper item. Hover on each one to see what is possible.
+7. Changing intensity will change how tall the mountain will be. The higher the number the taller the mountain.
+8. The 3D Mode is more for building organics and can take much longer to set.
+9. The addition mode is for adding a mountain or when clicked, creating a matching hole depending on the other parameters and the selected heightmap brush.
 ### Pictures
-- None at the moment
+![img.png](BrushItMainMenu.png)
+![img.png](BrushItHeightMapMenu.png)
 ### Videos
 - None at the moment