Add inherited methods for IDABot

docs/idabot.rst

 IDABot
 ======
 
-.. TODO: Missing methods: on_start, on_step
-
 .. class:: library.IDABot
 
    This is the basis of your bot. It contains all available managers and some
@@ -29,6 +27,20 @@ IDABot
 
       An instance of the class :class:`library.BuildingPlacer`
 
+   Inherited methods:
+
+   .. method:: IDABot.on_game_start(self)
+
+      This method when Starcraft has stared, when you inherit it you have to
+      call the parent's on_step method in order to make it work (see
+      :ref:`gettingstarted`).
+
+   .. method:: IDABot.on_step(self)
+
+      This method is run on every tick of the game, when you inherit it you
+      have to call the parent's on_step method in order to make it work (see
+      :ref:`gettingstarted`).
+
    Methods:
 
    .. method:: IDABot.get_all_units(self) -> List[library.Unit]