updated repo layout

day04/4b/Board.go

@@ -0,0 +1,16 @@
+package main
+
+type Board struct {
+	Values [5][5]boardValue
+	Hash   map[int]location
+}
+
+type boardValue struct {
+	Value   int
+	Visited bool
+}
+
+type location struct {
+	x int
+	y int
+}