diff --git a/domain-model.md b/domain-model.md
index 653f474..f30fc60 100644
--- a/domain-model.md
+++ b/domain-model.md
@@ -1 +1,33 @@
-#Domain Models In Here
\ No newline at end of file
+<span style="font-size:0.5em;">Story</span>
+<br />
+As a supermarket shopper,
+So that I can pay for products at checkout,
+I'd like to be able to know the total cost of items in my basket.
+
+
+<span style="font-size:0.5em;">Model</span>
+<br />
+| Classes         | Methods                                                                                 | Scenario                      | Outputs                   |
+|-----------------|-----------------------------------------------------------------------------------------|-------------------------------|---------------------------|
+| `SuperMarket`   | `itemInBasket(string itemName, decimal itemPrice, Dictionary<string,int> receipt)`      | Item is in not in the basket  | true                      |
+|                 |                                                                                         |                               |                           |
+|                 | `itemInBasket(Dictionary<string,int> receipt)`                                          | Item is not in the basket     | false                     |
+|                 |                                                                                         |                               |                           |
+|                 | `putItemInBasket(Dictionary<string,int> receipt, bool isItemInBasket)`                  |                               |                           |
+|                 |                                                                                         |                               |                           |
+|                 | `costCalculate(Dictionary<string,int> receipt)`                                         |                               | Total cost (int total)    |
+|                 |                                                                                         |                               |                           |
+<br />
+<span style="font-size:0.5em;">Story</span>
+<br />
+As an organized individual,
+So that I can evaluate my shopping habits,
+I'd like to see an itemized receipt that includes the name and price of the products
+I bought as well as the quantity, and a total cost of my basket.
+
+<span style="font-size:0.5em;">Model</span>
+<br />
+| Classes         | Methods                                                 | Scenario                                                | Outputs                   |
+|-----------------|---------------------------------------------------------|---------------------------------------------------------|---------------------------|
+| `SuperMarket`   | `showReceipt(Dictionary<string,int> receipt, int total)`| Print items with their costs, and total cost at the end | Printed receipt on console|
+|                 |                                                         |                                                         |                           |
\ No newline at end of file
diff --git a/tdd-domain-modelling.CSharp.Main/Basket.cs b/tdd-domain-modelling.CSharp.Main/Basket.cs
new file mode 100644
index 0000000..fc56b2c
--- /dev/null
+++ b/tdd-domain-modelling.CSharp.Main/Basket.cs
@@ -0,0 +1,35 @@
+
+
+namespace tdd_domain_modelling.CSharp.Test
+{
+    public class Basket
+    {
+        private Dictionary<string, decimal> _items = new Dictionary<string, decimal>();
+        private decimal _total = 0;
+
+
+        public bool Add(string item, decimal price)
+        {
+            if (_items.ContainsKey(item))
+            {
+                
+                return false;
+            }
+            else
+            {
+                _items.Add(item, price);
+                return true;
+            }
+        }
+
+        public decimal Total()
+        {
+            foreach (int value in _items.Values)
+            {
+                _total += value;
+            }
+
+            return _total;
+        }
+    }
+}
\ No newline at end of file
diff --git a/tdd-domain-modelling.CSharp.Test/BasketTests.cs b/tdd-domain-modelling.CSharp.Test/BasketTests.cs
new file mode 100644
index 0000000..214dfa5
--- /dev/null
+++ b/tdd-domain-modelling.CSharp.Test/BasketTests.cs
@@ -0,0 +1,44 @@
+using NUnit.Framework;
+using tdd_domain_modelling.CSharp.Main;
+
+
+namespace tdd_domain_modelling.CSharp.Test
+{
+    [TestFixture]
+    public class BasketTests
+    {
+        [TestCase("Bread", 0.99,  true)]
+        [TestCase("Kinder Surprise", 0.99, false)]
+        public void TestAdd(string item, decimal price, bool isItemPresent)
+        {
+            //arrange
+            Basket basket = new Basket();
+
+            basket.Add("Apple 100g", 2.49m);
+            basket.Add("Carrot 100g", 1.99m);
+            basket.Add("Kinder Surprise", 0.99m);
+             
+
+            //act
+            bool result1 = basket.Add(item, price);
+
+            //assert
+            Assert.AreEqual(isItemPresent, result1);
+
+        }
+        [TestCase(9)]
+        public void TestTotal(decimal expected)
+        {
+            //arrange
+            Basket basket = new Basket();
+            basket.Add("Apple 100g", 2);
+            basket.Add("Carrot 100g", 3);
+            basket.Add("Kinder Surprise", 4);
+            //act
+            decimal result = basket.Total();
+
+            //assert
+            Assert.IsTrue(result == expected);
+        }
+    }
+}
\ No newline at end of file
diff --git a/tdd-domain-modelling.CSharp.Test/CohortManagerTests.cs b/tdd-domain-modelling.CSharp.Test/CohortManagerTests.cs
index 56f3873..7b324a0 100644
--- a/tdd-domain-modelling.CSharp.Test/CohortManagerTests.cs
+++ b/tdd-domain-modelling.CSharp.Test/CohortManagerTests.cs
@@ -10,6 +10,8 @@ public class CohortManagerTest
         public void FirstTest()
         {
             CohortManager core = new CohortManager();
+
+
         }
     }
 }
\ No newline at end of file