diff --git a/domain-model.md b/domain-model.md
index 653f474..dd29bd1 100644
--- a/domain-model.md
+++ b/domain-model.md
@@ -1 +1,60 @@
-#Domain Models In Here
\ No newline at end of file
+#Domain Models In Here
+
+```
+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.
+```
+
+```C# 
+struct Item
+	PROPERTIES:
+	public string itemName {get}
+	public float cost {get}
+
+	METHODS:
+		public Item(string itemName, float cost)
+
+Class Basket
+	properties:
+	public List<item> items {get}
+
+	methods:
+	public Basket() // initialize items list
+	public void AddItem(string itemName, float cost)
+	public float TotalCost(List<Item>) return the total cost of the basket
+```
+
+
+```
+As an organised individual,
+So that I can evaluate my shopping habits,
+I'd like to see an itemised receipt that includes the name and price of the products
+I bought as well as the quantity, and a total cost of my basket.
+
+```
+
+``` C#
+struct Item
+	PROPERTIES:
+	public string itemName {get}
+	public float cost {get}
+
+	METHODS:
+		public Item(string itemName, float cost)
+
+Class Basket
+	properties:
+	public List<item> items {get}
+
+	methods:
+	public Basket() // initialize items list
+
+	public void AddItem(string itemName, float cost)
+
+	public float TotalCost(List<Item>) return the total cost of the basket
+
+	public List<string> Receipt(List<item> items) 
+		returns a list with:| Name | Price | Quantity |
+		Last index of list  | TotalCost()             |
+```
\ 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..fed4938
--- /dev/null
+++ b/tdd-domain-modelling.CSharp.Main/Basket.cs
@@ -0,0 +1,62 @@
+namespace tdd_domain_modelling.CSharp.Main
+{
+    public class Basket
+    {
+        public List<Item> items { get; }
+
+        public Basket()
+        {
+            items = new List<Item>();
+        }
+
+        public void AddItem(string itemName, float price)
+        {
+            items.Add(new Item(itemName, price));
+        }
+
+        public float TotalCost()
+        {
+            float totalCost = 0;
+            foreach (var item in items)
+            {
+                totalCost += item.Cost;
+            }
+            return totalCost;
+        }
+
+        public List<string> Receipt()
+        {
+            List<string> receipt = new List<string>();
+            Dictionary<Item, float> itemQuantity = new Dictionary<Item, float>();
+            foreach (var item in items)
+            {
+                if (!itemQuantity.ContainsKey(item))
+                {
+                    itemQuantity.Add(item, 1);
+                }
+                else
+                {
+                    itemQuantity[item]++;
+                }
+            }
+
+            foreach (var item in itemQuantity)
+            {
+                receipt.Add($"|{item.Key.ItemName}|{item.Key.Cost}|x{item.Value}");
+            }
+            receipt.Add($"Total cost: {TotalCost()}");
+            return receipt;
+        }
+    }
+
+    public struct Item
+    {
+        public string ItemName { get; }
+        public float Cost { get; }
+        public Item(string itemName, float cost)
+        {
+            ItemName = itemName;
+            Cost = cost;
+        }
+    }
+}
diff --git a/tdd-domain-modelling.CSharp.Test/BasketTest.cs b/tdd-domain-modelling.CSharp.Test/BasketTest.cs
new file mode 100644
index 0000000..6043e70
--- /dev/null
+++ b/tdd-domain-modelling.CSharp.Test/BasketTest.cs
@@ -0,0 +1,73 @@
+using Microsoft.VisualStudio.TestPlatform.ObjectModel;
+using NUnit.Framework;
+using tdd_domain_modelling.CSharp.Main;
+
+namespace tdd_domain_modelling.CSharp.Test
+{
+    [TestFixture]
+    public class BasketTest
+    {
+        private Basket? basket;
+        [SetUp]
+        public void Init()
+        {
+            basket = new Basket();
+        }
+
+        [TestCase("", 123f)]
+        [TestCase("Test", 0f)]
+        public void CreateItem(string name, float cost)
+        {
+            Item item = new Item(name, cost);
+            Assert.That(item.ItemName, Is.EqualTo(name));
+            Assert.That(item.Cost, Is.EqualTo(cost));
+        }
+
+        [TestCase("Test", 10f)]
+        public void AddItem(string name, float cost)
+        {
+            Basket basket = new Basket();
+            basket.AddItem(name, cost);
+            Assert.That(basket.items.Count, Is.EqualTo(1));
+        }
+
+        [TestCase("Test", 10f)]
+        [TestCase("Test", 0f)]
+        [TestCase("Test", 1000f)]
+        public void TotalCost(string name, float cost)
+        {
+            Basket basket = new Basket();
+            basket.AddItem(name, cost);
+            Assert.That(basket.TotalCost(), Is.EqualTo(cost));
+        }
+
+        [Test]
+        public void EmptyReceipt()
+        {
+            List<string> expectedResult = new List<string>()
+            {
+                { "Total cost: 0"}
+            };
+            Basket basket = new Basket();
+            Assert.That(basket.Receipt(), Is.EqualTo(expectedResult));
+        }
+
+        [Test]
+        public void ReceiptWithItems()
+        {
+            List<string> expectedResult = new List<string>()
+            {
+                {"|Milk|10|x5"},
+                {"|Chips|20|x1"},
+                { "Total cost: 70"}
+            };
+            Basket basket = new Basket();
+            for (int i = 0; i < 5; i++)
+            {
+                basket.AddItem("Milk", 10);
+            }
+            basket.AddItem("Chips", 20);
+            Assert.That(basket.Receipt(), Is.EqualTo(expectedResult));
+        }
+    }
+}
\ No newline at end of file
diff --git a/tdd-domain-modelling.CSharp.Test/tdd-domain-modelling.CSharp.Test.csproj b/tdd-domain-modelling.CSharp.Test/tdd-domain-modelling.CSharp.Test.csproj
index 758370d..fee6fc1 100644
--- a/tdd-domain-modelling.CSharp.Test/tdd-domain-modelling.CSharp.Test.csproj
+++ b/tdd-domain-modelling.CSharp.Test/tdd-domain-modelling.CSharp.Test.csproj
@@ -7,9 +7,9 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="microsoft.net.test.sdk" Version="17.5.0" />
-    <PackageReference Include="nunit" Version="3.13.3" />
-    <PackageReference Include="NUnit3TestAdapter" Version="4.4.2" />
+    <PackageReference Include="microsoft.net.test.sdk" Version="17.8.0" />
+    <PackageReference Include="nunit" Version="4.0.1" />
+    <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" />
   </ItemGroup>
 
     <ItemGroup>