Add a NuGet-specific README.

Author: alexrp

Directory.Build.props

@@ -27,8 +27,8 @@
 With the Windows console host now supporting virtual terminal sequences, it
 makes little sense for console interaction to still be centered around the old
 Windows console host and the many limitations it had. System.Terminal provides
-an API centered around an emulated VT100 terminal (with various modern and
-widely supported extensions) and works on all desktop platforms that .NET 6+
+an API centered around a VT100 terminal with some extensions from later models
+and modern terminal emulators. It works on all desktop platforms that .NET 6+
 supports.</PackageDescription>
         <PackageLicenseExpression>ISC</PackageLicenseExpression>
         <PackageOutputPath>$(MSBuildThisFileDirectory)pkg/feed/</PackageOutputPath>

Directory.Build.targets

@@ -23,11 +23,11 @@
             <PropertyGroup>
                 <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
                 <IsTrimmable Condition="'$(OutputType)' == 'Library' and '$(DevelopmentDependency)' != 'true'">>true</IsTrimmable>
-                <PackageReadmeFile>README.md</PackageReadmeFile>
+                <PackageReadmeFile>PACKAGE.md</PackageReadmeFile>
             </PropertyGroup>
 
             <ItemGroup>
-                <None Include="$(MSBuildThisFileDirectory)README.md"
+                <None Include="$(MSBuildThisFileDirectory)PACKAGE.md"
                       Pack="true"
                       PackagePath=""
                       Visible="false" />

PACKAGE.md

@@ -0,0 +1,27 @@
+# System.Terminal
+
+System.Terminal is a toolkit for writing terminal-based applications. It is
+effectively a complete replacement for System.Console.
+
+With the Windows console host now supporting virtual terminal sequences, it
+makes little sense for console interaction to still be centered around the old
+Windows console host and the many limitations it had. System.Terminal provides
+an API centered around a [VT100 terminal](https://vt100.net) with some
+extensions from later models and modern terminal emulators. It works on all
+desktop platforms that .NET 6+ supports.
+
+This project offers the following packages:
+
+* [Terminal](https://www.nuget.org/packages/Terminal): Provides the core
+  terminal API.
+* [Terminal.Hosting](https://www.nuget.org/packages/Terminal.Hosting): Provides
+  the terminal hosting model.
+* [Terminal.Extensions](https://www.nuget.org/packages/Terminal.Extensions):
+  Provides terminal hosting and logging for the .NET Generic Host.
+
+See the
+[sample programs](https://github.com/alexrp/system-terminal/tree/master/src/samples)
+for examples of what the API can do.
+
+For more information, please visit the
+[project page](https://github.com/alexrp/system-terminal).

README.md

@@ -10,9 +10,9 @@ effectively a complete replacement for System.Console.
 With the Windows console host now supporting virtual terminal sequences, it
 makes little sense for console interaction to still be centered around the old
 Windows console host and the many limitations it had. System.Terminal provides
-an API centered around an emulated [VT100 terminal](https://vt100.net) (with
-various modern and widely supported extensions) and works on all desktop
-platforms that .NET 6+ supports.
+an API centered around a [VT100 terminal](https://vt100.net) with some
+extensions from later models and modern terminal emulators. It works on all
+desktop platforms that .NET 6+ supports.
 
 Please note that, since System.Terminal replaces a very fundamental component of
 the framework, the use of certain framework APIs becomes problematic. As an