add input box to readme

README.md

@@ -114,6 +114,25 @@ Has the following additional characteristics:
 * Supports providing hints to be shown when the control does not have focus and the value is empty.
 * Supports delaying `TextChanged` events
 
+### Interaction.InputBox => StylableInputBox
+With the `StylableInputBox`, you can create forms similar to VB.NETs `Interaction.InputBox` but the handling is a bit different as we allow you to style the form
+before showing.
+
+Let's create an input box first:  
+```csharp
+StylableInputBox<NumericUpDown> iBox = StylableInputBox<NumericUpDown>.BUILDER
+                .WithTitle("Numeric Test", MessageBoxIcon.Information)
+                .WithText("Please enter a random number between -100 and 100")
+                .WithHelpButton(new Uri("https://github.com/Assorted-Development/winforms-stylable-controls"))
+                .WithTimeout(TimeSpan.FromSeconds(30), DialogResult.Cancel)
+                .ForNumericValue(0, -100, 100);
+```
+This will create an input box for numeric values (currently, we support text and numeric) with a title and a message and two buttons: Okay, Cancel
+Now, let's style the form as we want to: `iBox.StylableControls.Text.ForeColor = Color.Red;`
+At last, you can show the dialog using `iBox.ShowDialog()`
+
+**Note:** If you change the size on the controls (e.g. increase the font size), please call `UpdateSize()` to update the UI to the new settings. Otherwise, the Ui may look weird.
+
 
 ## Contributions