Added info about Wireworld.

diff --git a/wireworld/README.md b/wireworld/README.md
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+[Wireworld]
+===========
+
+
+States
+------
+* Empty
+* Electron head
+* Electron tail
+* Conductor
+
+
+Transitions
+-----------
+* Empty -> Empty
+* Electron head -> Electron tail
+* Electron tail -> Conductor
+* Conductor -> Electron head if exactly one or two of the neighbouring cells
+  are electron heads, or remains Conductor otherwise.
+
+
+[Wireworld]: http://en.wikipedia.org/wiki/Wireworld