added captures, movement, legalmoves hover, and basics of game

Position.java

@@ -5,4 +5,9 @@ public class Position {
     this.x = x;
     this.y = y;
   }
+
+  public boolean equals(Object o) {
+    Position pos = (Position) o;
+    return pos.x == this.x && pos.y == this.y;
+  }
 }