Treeview Docs

Added Treeview docs
Improved some stuff in the treeview object

docs/objects/Treeview/setRoot.md

@@ -0,0 +1,31 @@
+## setRoot
+
+### Description
+
+Sets a new root node for the Treeview object. This can be useful if you want to replace the current root node with a child node or an entirely new node.
+
+### Parameters
+
+1. `node` The new root node for the Treeview object. This should be a valid Treeview node object.
+
+### Returns
+
+1. `object` The object in use
+
+### Usage
+
+* Creates a Treeview, adds a child node, and then sets the child node as the new root node:
+
+```lua
+local basalt = require("basalt")
+
+local mainFrame = basalt.createFrame()
+local treeview = mainFrame:addTreeview()
+
+local childNode = treeview:getRoot().addChild("New Child")
+treeview:setRoot(childNode)
+
+basalt.autoUpdate()
+```
+
+In this example, a Treeview object is created and added to the mainFrame. The `getRoot` method is used to access the root node, and a new child node is added to it with the `addChild` method. Then, the `setRoot` method is used to set the new child node as the root node of the Treeview object.