First runnable version: Implemented main.go and created basic game window

main.go

@@ -1 +1,11 @@
 package main
+
+import (
+	"tictactoe/game"
+)
+
+func main() {
+	// calls the CreateWindow function and runs that window
+	window := game.CreateWindow()
+	window.ShowAndRun()
+}