start coins decomp

include/coins.h

@@ -1,6 +1,12 @@
 #ifndef GUARD_COINS_H
 #define GUARD_COINS_H
 
-void SetCoins(u16 newValue);
+void PrintCoinsString(u32 coinAmount);
+void ShowCoinsWindow(u32 coinAmount, u8 x, u8 y);
+void HideCoinsWindow(void);
+u16 GetCoins(void);
+void SetCoins(u16 coinAmount);
+bool8 AddCoins(u16 toAdd);
+bool8 SubtractCoins(u16 toSub);
 
 #endif // GUARD_COINS_H