Docs update

Some more stuff for docs

docs/objects/Animation/onStart.md

@@ -0,0 +1,16 @@
+## onStart
+`onStart(self)`<br>
+This is a event which gets fired as soon as the animation is started.
+
+```lua
+local basalt = require("Basalt")
+
+local mainFrame = basalt.createFrame()
+local testButton = mainFrame:addButton("buttonToAnimate")
+local aAnimation = mainFrame:addAnimation():setObject(testButton):changeTextColor({colors.red, colors.yellow, colors.green}, 2)
+aAnimation:onStart(function()
+    basalt.debug("The animation is started")
+end)
+
+aAnimation:play()
+```