Add constant values for new currencies

src/currencyExchange.h

@@ -2,8 +2,12 @@
 
 #define USD_RATE_OF_ONE_EURO 1.07
 #define GBP_RATE_OF_ONE_EURO 0.89
+#define JAPANESE_YEN_RATE_OF_ONE_EURO 140.9
+#define CHINESE_YUAN_RATE_OF_ONE_EURO 7.29
 
 #define CURRENCY_CODE_USD 1
 #define CURRENCY_CODE_GBP 2
+#define CURRENCY_CODE_JAPANESE_YEN 3
+#define CURRENCY_CODE_CHINESE_YUAN 4
 
 float convert(float euro, int newCurrencyCode);