Created Disable Bag Use In Battle (markdown)

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+## Disable Bag Use In Battle
+
+Credit to ghoulslash.
+
+Using a flag, we can prevent the player from using items in battle.
+
+### Define the flag.
+In [include/constants/flags.h](../blob/master/include/constants/flags.h), replace an unused flag with `FLAG_DISABLE_BAG`, eg.
+```c
+#define FLAG_DISABLE_BAG 0x493
+```
+
+### Toggle Bag Usage
+Open [src/battle_main.c](../blob/master/src/battle_main.c). Search for the line, [case B_ACTION_USE_ITEM:](../blob/master/src/battle_main.c#L4262) in the function `static void HandleTurnActionSelectionState(void)`. Change the code directly underneath to:
+```c
+if (FlagGet(FLAG_DISABLE_BAG) || gBattleTypeFlags & (BATTLE_TYPE_LINK
+                                            | BATTLE_TYPE_FRONTIER_NO_PYRAMID
+                                            | BATTLE_TYPE_EREADER_TRAINER
+                                            | BATTLE_TYPE_x2000000))
+{
+    // etc.
+```
+
+If `FLAG_DISABLE_BAG` is set, selecting `BAG` in battle will display the message `Items can't be used now.`
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