Add maku tree map indicator during intro

Move map icon and dungeon id documentation to symbols.asm

Core/symbols.asm

@@ -54,6 +54,37 @@ OOSPROG         = $7EF3D6
 ;   f - Flipped by fortune tellers to decide fortune set to give
 OOSPROG2       = $7EF3C6
 
+; Map icon
+;   0x00 - Red X on castle    | Save zelda
+;   0x01 - Red X on Kakariko  | Talk to villagers about elders
+;   0x02 - Red X on Eastern   | Talk to Sahasrahla
+;   0x03 - Pendants and MS    | Obtain the master sword
+;   0x04 - Master sword on LW | Grab the master sword
+;   0x05 - Skull on castle    | Kill Agahnim
+;   0x06 - Crystal on POD     | Get the first crystal
+;   0x07 - Crystals           | Get all 7 crystals
+;   0x08 - Skull on GT        | Climb Ganon's Tower
+MAPICON         = $7EF3C7
+
+; Dungeon ID Legend
+; Mushroom Grotto ID 0x0C (Palace of Darkness)
+; Tail Palace ID 0x0A (Swamp Palace)
+; Kalyxo Castle ID 0x10 (Skull Woods)
+; Zora Temple ID 0x16 (Thieves Town)
+; Glacia Estate 0x12 (Ice Palace)
+; Goron Mines 0x0E (Misery Mire)
+; Dragon Ship 0x18 (Turtle Rock)
+
+; .wbs tipm
+;   p - Palace of Darkness
+;   s - Swamp Palace
+;   w - Skull Woods
+;   b - Thieves' Town
+;   i - Ice Palace
+;   m - Misery Mire
+;   t - Turtle Rock
+CRYSTALS        = $7EF37A
+
 ; .... ...m
 ;   m - maku tree has met link (0: no | 1: yes)
 OOSPROG3       = $7EF3D4