Initial commit

Shopping/Test.java

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+public class Test {
+    public static void main(String[] args) {
+        Customer cs = new Customer("zhang", 2000);
+        Cashier cash = new Cashier("li", 1000);
+        cs.addGood(new Good("apple", 23.5f, 3));
+        cs.addGood(new Good("book", 67.5f, 2));
+        cs.addGood(new Good("Desk", 200f, 3));
+        cash.cash(cs);
+        cash.print(cs);
+    }
+}