Adding note to the monster 058 for the unwary

exercises/058_quiz7.zig

@@ -28,6 +28,16 @@
 // a little Zig program to help him plan his trips through the woods,
 // but it has some mistakes.
 //
+// *************************************************************
+// *                A NOTE ABOUT THIS EXERCISE                 *
+// *                                                           *
+// * You do NOT have to read an understand every bit of this   *
+// * program. This is a very big example. Feel free to skim    *
+// * through it and then just focus on the few parts that are  *
+// * actually broken!                                          *
+// *                                                           *
+// *************************************************************
+//
 const print = @import("std").debug.print;
 
 // The grue is a nod to Zork.