Updated docs

There is still stuff to do

docs/objects/Thread/start.md

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+## start
+starts a new thread and executes the function
+#### Parameters: 
+1. `function` the function which should be executed
+
+#### Returns:
+1. `object` The object in use
+
+#### Usage:
+* Starts a new thread
+```lua
+local mainFrame = basalt.createFrame()
+local aThread = mainFrame:addThread()
+local function randomThreadFunction()
+    while true do
+        basalt.debug("Thread is active")
+        os.sleep(1) -- a sleep/coroutine.yield() or pullEvent is required otherwise we will never come back to the main program (error)
+    end
+end
+aThread:start(randomThreadfunction)
+```
+you are also able to start threads via xml:
+```lua
+    basalt.setVariable("myThread", function() while true do os.sleep(1) end end)
+```
+```xml
+<thread thread="myThread" start="true"/>
+```