move money transaction interface

src/main/java/com/faf223/expensetrackerfaf/model/IMoneyTransaction.java

@@ -0,0 +1,11 @@
+package com.faf223.expensetrackerfaf.model;
+
+import com.faf223.expensetrackerfaf.model.User;
+
+public interface IMoneyTransaction {
+
+    User getUser();
+    int getAmount();
+    String getCategory();
+
+}