Treeview Docs

Added Treeview docs
Improved some stuff in the treeview object

docs/objects/Treeview/getChildren.md

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+## getChildren
+
+### Description
+
+The `getChildren` method returns a table containing all the children nodes of a specified node within a Treeview object.
+
+### Returns
+
+1. `table` A table containing all the children nodes of the specified node
+
+### Usage
+
+* Creates a Treeview, adds a child node, and retrieves its children:
+
+```lua
+local basalt = require("basalt")
+
+local mainFrame = basalt.createFrame()
+local treeview = mainFrame:addTreeview()
+
+local rootNode = treeview:getRoot()
+local childNode1 = rootNode.addChild("Child Node 1")
+local childNode2 = rootNode.addChild("Child Node 2")
+
+local children = rootNode.getChildren()
+
+basalt.debug("Children count:", #children)
+
+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 two new child nodes are added to it using the `addChild` method. The `getChildren` method is then used to retrieve a table containing all the children nodes of the root node, and the number of children is printed to the console using `basalt.debug`.