feat: initial functional release of Stock Pignon

app/src/main/java/com/stock/pignon/CartItem.java

@@ -0,0 +1,27 @@
+// CartItem.java
+package com.stock.pignon;
+
+public class CartItem {
+    private final String name;
+    private final int minPrice;
+    private final int maxPrice;
+    private int quantity;
+    private final String imageFile; // Image name without extension
+
+    public CartItem(String name, int minPrice, int maxPrice, int quantity, String imageFile) {
+        this.name = name;
+        this.minPrice = minPrice;
+        this.maxPrice = maxPrice;
+        this.quantity = quantity;
+        this.imageFile = imageFile;
+    }
+
+    public String getName() { return name; }
+    public int getMinPrice() { return minPrice; }
+    public int getMaxPrice() { return maxPrice; }
+    public int getQuantity() { return quantity; }
+    public void setQuantity(int quantity) { this.quantity = quantity; }
+    public int getTotalMin() { return minPrice * quantity; }
+    public int getTotalMax() { return maxPrice * quantity; }
+    public String getImageFile() { return imageFile; }
+}