Merge pull request #28 from BoBoBaSs84/docs/describe-the-attributes

docs: describe the attributes

Directory.Build.props

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <VersionMajor>1</VersionMajor>
-    <VersionMinor>4</VersionMinor>
+    <VersionMinor>5</VersionMinor>
     <VersionPatch>0</VersionPatch>
     <VersionPrefix>$(VersionMajor).$(VersionMinor).$(VersionPatch)</VersionPrefix>
     <VersionSuffix Condition="$(Configuration.Equals('Debug'))">Development</VersionSuffix>

README.md

@@ -78,6 +78,34 @@ Most of the implementation must be done despite the base class itself. The inten
 
 Further implementation possibilities can be achieved with the interfaces `INotifyCollectionChanged` and `INotifyCollectionChanging`.
 
+## The notification attributes
+
+The `NotifyChangedAttribute` and the `NotifyChangingAttribute` propagating the information also to those properties the are defined via the constructor. An example implementation could look like this:
+
+```csharp
+private sealed class TestClass : NotifyPropertyBase
+{
+  private int _quantity;
+  private int _value;
+
+  public TestClass(int quantity, int value)
+  {
+    Quantity = quantity;
+    Value = value;
+  }
+
+  [NotifyChanged(nameof(TotalValue))]
+  public int Quantity { get => _quantity; set => SetProperty(ref _quantity, value); }
+
+  [NotifyChanged(nameof(TotalValue))]
+  public int Value { get => _value; set => SetProperty(ref _value, value); }
+
+  public int TotalValue => Quantity * Value;
+}
+```
+
+If the `Quantity` property or the `Value` property is changed, a `PropertyChanged` event is also triggered for the `TotalValue` property.
+
 # Documentation
 
 The API documentation can be found [here](https://bobobass84.github.io/BB84.Notifications/).