feat : add price and currency valueObjects

Src/Product.Domain/ValueObjects/Currency.cs

@@ -0,0 +1,10 @@
+namespace Product.Domain.ValueObjects;
+
+public class Currency : ValueObject
+{
+    public string Value { get; private set; }
+    protected override IEnumerable<object> GetEqualityComponents()
+    {
+        throw new NotImplementedException();
+    }
+}

Src/Product.Domain/ValueObjects/Price.cs

@@ -0,0 +1,30 @@
+using Product.Domain.Exceptions;
+
+namespace Product.Domain.ValueObjects;
+
+public class Price : ValueObject
+{
+    public int Value { get; private set; }
+    public Currency Currency { get; private set; }
+
+    public Price()
+    {
+
+    }
+    protected override IEnumerable<object> GetEqualityComponents()
+    {
+        throw new NotImplementedException();
+    }
+
+    private void SetValue(int value)
+    {
+        if (value is 0)
+            throw new DomainValidationException("price can not be 0");
+
+        if(value < 0)
+            throw new DomainValidationException("price can not be negative");
+
+        Value = value;
+    }
+
+}