docs: Update samples to show default values using attribute API

Author: natemcmaster

README.md

@@ -55,17 +55,16 @@ public class Program
         => CommandLineApplication.Execute<Program>(args);
 
     [Option(Description = "The subject")]
-    public string Subject { get; }
+    public string Subject { get; } = "world";
 
     [Option(ShortName = "n")]
-    public int Count { get; }
+    public int Count { get; } = 1;
 
     private void OnExecute()
     {
-        var subject = Subject ?? "world";
         for (var i = 0; i < Count; i++)
         {
-            Console.WriteLine($"Hello {subject}!");
+            Console.WriteLine($"Hello {Subject}!");
         }
     }
 }

docs/samples/helloworld-attributes/HelloWorldAttributes.csproj

@@ -0,0 +1,9 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net5.0</TargetFramework>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

docs/samples/helloworld-attributes/Program.cs

@@ -0,0 +1,22 @@
+using System;
+using McMaster.Extensions.CommandLineUtils;
+
+public class Program
+{
+    public static int Main(string[] args)
+        => CommandLineApplication.Execute<Program>(args);
+
+    [Option(Description = "The subject")]
+    public string Subject { get; } = "world";
+
+    [Option(ShortName = "n")]
+    public int Count { get; } = 1;
+
+    private void OnExecute()
+    {
+        for (var i = 0; i < Count; i++)
+        {
+            Console.WriteLine($"Hello {Subject}!");
+        }
+    }
+}

docs/samples/samples.sln

@@ -63,6 +63,8 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "BuilderApi", "generic-host\
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "HelloWorld", "helloworld\HelloWorld.csproj", "{D444D44D-76BB-4FDB-9C06-1D8D30729F4A}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "HelloWorldAttributes", "helloworld-attributes\HelloWorldAttributes.csproj", "{81F83C18-B60C-4A3F-8896-4B280A8F06D6}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -361,6 +363,18 @@ Global
 		{D444D44D-76BB-4FDB-9C06-1D8D30729F4A}.Release|x64.Build.0 = Release|Any CPU
 		{D444D44D-76BB-4FDB-9C06-1D8D30729F4A}.Release|x86.ActiveCfg = Release|Any CPU
 		{D444D44D-76BB-4FDB-9C06-1D8D30729F4A}.Release|x86.Build.0 = Release|Any CPU
+		{81F83C18-B60C-4A3F-8896-4B280A8F06D6}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{81F83C18-B60C-4A3F-8896-4B280A8F06D6}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{81F83C18-B60C-4A3F-8896-4B280A8F06D6}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{81F83C18-B60C-4A3F-8896-4B280A8F06D6}.Debug|x64.Build.0 = Debug|Any CPU
+		{81F83C18-B60C-4A3F-8896-4B280A8F06D6}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{81F83C18-B60C-4A3F-8896-4B280A8F06D6}.Debug|x86.Build.0 = Debug|Any CPU
+		{81F83C18-B60C-4A3F-8896-4B280A8F06D6}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{81F83C18-B60C-4A3F-8896-4B280A8F06D6}.Release|Any CPU.Build.0 = Release|Any CPU
+		{81F83C18-B60C-4A3F-8896-4B280A8F06D6}.Release|x64.ActiveCfg = Release|Any CPU
+		{81F83C18-B60C-4A3F-8896-4B280A8F06D6}.Release|x64.Build.0 = Release|Any CPU
+		{81F83C18-B60C-4A3F-8896-4B280A8F06D6}.Release|x86.ActiveCfg = Release|Any CPU
+		{81F83C18-B60C-4A3F-8896-4B280A8F06D6}.Release|x86.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE