Docs update

Some more stuff for docs

docs/objects/Animation/addMode.md

@@ -0,0 +1,30 @@
+## addMode
+Adds a new easing curve into the available easing list. Checkout the animation object if you want to know how this works.
+
+#### Parameters: 
+
+1. `string` - The name of the curve you want to use.
+2. `functon` - The function to call
+
+#### Returns: 
+
+1. `animation` Animation in use
+
+#### Usage:
+
+* Creates a new curve
+
+```lua
+local mainFrame = basalt.createFrame()
+local testButton = mainFrame:addButton("buttonToAnimate")
+local aAnimation = mainFrame:addAnimation():setObject(testButton)
+
+local function easeInBack(t) -- t is the time from 0 to 1
+    local c1 = 1.70158;
+    local c3 = c1 + 1
+    return c3*t^3-c1*t^2
+end
+
+aAnimation:addMode("coolEaseInBack", easeInBack)
+aAnimation:setMode("coolEaseInBack"):move(15,3,2):play()
+```