Updated Introduction (markdown)

Introduction.md

@@ -6,8 +6,10 @@ The usual workflow is that you first create a bunch of locations or vectors. In
 ```
 # 1) creation step (create locations in the shape of a circle)
 set {_circle::*} to circle at player with radius 1 and density 5
+
 # 2) transformation step (make circle 2 times larger)
 set {_bigcircle::*} to {_circle::*} scaled at player by 2
+
 # 3) do something with your locations (not part of Biosphere2)
 show happy villager at {_bigcircle::*} 
 ```