implement zesa currency swap feature

src/main/java/zw/qantra/tm/domain/models/Transaction.java

@@ -51,6 +51,7 @@ public class Transaction extends BaseEntity {
     private String creditAccount;
     @Enumerated(EnumType.STRING)
     private CurrencyType creditCurrency;
+    private BigDecimal creditAmount;
     private String creditName;
     private String creditCard;
     private String creditRef;