Added custom configured client CSV mappings based on email address domain

column_mapping.json

@@ -0,0 +1,17 @@
+{
+  "default": {
+    "Item_ID": "Item_ID",
+    "Item_Name": "Item_Name",
+    "Item_Description": "Item_Description",
+    "Item_Price": "Item_Price",
+    "Item_Quantity": "Item_Quantity"
+  },
+  "hamiltron.net": {
+    "Item_ID": "ID",
+    "Item_Name": "Name",
+    "Item_Description": "Description",
+    "Item_Price": "Price",
+    "Item_Quantity": "Quantity"
+  }
+}
+