Updated docs

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docs/objects/Basalt/setVariable.md

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+## basalt.setVariable
+This stores a variable which you're able to access via xml. You are also able to add a function, which then gets called by object events created in XML.
+
+#### Parameters: 
+1. `string` a key name
+1. `any` any variable
+
+#### Usage:
+* Adds a function to basalt.
+```lua
+basalt.setVariable("clickMe", function()
+    basalt.debug("I got clicked")
+end)
+```
+```xml
+<button onClick="clickMe" text="Click me" />
+```