added COllisionManager

src/engine/CollisionEngine/Triangle.java

@@ -0,0 +1,17 @@
+package engine.CollisionEngine;
+
+import java.awt.geom.Line2D;
+
+import java.util.ArrayList;
+
+public class Triangle {
+    public ArrayList<Line2D> sides;
+    public boolean collides(Line2D line)
+    {
+        for(Line2D side : sides)
+            if(side.intersectsLine(line))
+                return true;
+
+        return false;
+    }
+}