Update doc/enemies.adoc

Author: macrozone

doc/enemies.adoc

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 Enemies
 -------
 
+image:Bildschirmfoto 2016-06-26 um 15.31.42.png[alt=""]
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 In the original game the shape of the "enemies" are defined in a large class and they are created in waves. For this tutorial we keep it simpler. We have some pre-defined enemy-arrangements that repeat themselves.
 
 Let's first introduce a new type `Enemy`:
 
 {% codesnippet "https://raw.githubusercontent.com/macrozone/elm-hexagon-tutorial/chapter/enemies/src/Hexagon.elm", lines="26:30", language="elm" %}{% endcodesnippet %}
 
 
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 * radius: the distance of the enemies to the center
 * parts: a list of true/false that indicate where the enemy has a "hole"