Update example in README.md (#1192)

* Update example in README.md

* Update README.md

Co-authored-by: slozier <slozier@users.noreply.github.com>

Author: BCSharp

README.md

@@ -6,28 +6,49 @@ IronPython 3
 
 IronPython is an open-source implementation of the Python programming language which is tightly integrated with .NET. IronPython can use .NET and Python libraries, and other .NET languages can use Python code just as easily.
 
+IronPython 3 targets Python 3, including the re-organized standard library, Unicode strings, and all of the other new features.
+
+
 | **What?** | **Where?** |
 | --------: | :------------: |
 | **Windows/Linux/macOS Builds** | [![Build status](https://dotnet.visualstudio.com/IronLanguages/_apis/build/status/ironpython3)](https://dotnet.visualstudio.com/IronLanguages/_build/latest?definitionId=43) [![Github build status](https://github.com/IronLanguages/ironpython3/workflows/CI/badge.svg)](https://github.com/IronLanguages/ironpython3/actions?workflow=CI) |
 | **Downloads** | [![NuGet](https://img.shields.io/nuget/vpre/IronPython.svg)](https://www.nuget.org/packages/IronPython/3.4.0-alpha1) [![Release](https://img.shields.io/github/release/IronLanguages/ironpython3.svg?include_prereleases)](https://github.com/IronLanguages/ironpython3/releases/latest)|
 | **Help** | [![Gitter chat](https://badges.gitter.im/IronLanguages/ironpython.svg)](https://gitter.im/IronLanguages/ironpython) [![StackExchange](https://img.shields.io/stackexchange/stackoverflow/t/ironpython.svg)](http://stackoverflow.com/questions/tagged/ironpython) |
 
 
-Comparison of IronPython vs. C# for 'Hello World'
+## Examples
 
-C#:
+The following C# program:
 
 ```cs
-System.Console.WriteLine("Hello World");
+using System.Windows.Forms;
+
+MessageBox.Show("Hello World!", "Greetings", MessageBoxButtons.OKCancel);
 ```
 
-IronPython:
+can be written in IronPython as follows:
 
 ```py
-print("Hello World")
+import clr
+clr.AddReference("System.Windows.Forms")
+from System.Windows.Forms import MessageBox, MessageBoxButtons
+
+MessageBox.Show("Hello World!", "Greetings", MessageBoxButtons.OKCancel)
 ```
 
-IronPython 3 targets Python 3, including the re-organized standard library, Unicode strings, and all of the other new features.
+Here is an example how to call Python code from a C# program.
+
+```cs
+var eng = IronPython.Hosting.Python.CreateEngine();
+var scope = eng.CreateScope();
+eng.Execute(@"
+def greetings(name):
+    return 'Hello ' + name.title() + '!'
+", scope);
+dynamic greetings = scope.GetVariable("greetings");
+System.Console.WriteLine(greetings("world"));
+```
+This example assumes that `IronPython` has been added to the C# project as a NuGet package.
 
 ## Code of Conduct
 This project has adopted the code of conduct defined by the Contributor Covenant to clarify expected behavior in our community.