Add ServiceController package readme

src/libraries/System.ServiceProcess.ServiceController/src/PACKAGE.md

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+## About
+
+<!-- A description of the package and where one can find more documentation -->
+Provides the System.ServiceProcess.ServiceController API, which allows to connect to a Windows service, manipulate it, or get information about it. Not supported on other platforms.
+
+## Key Features
+
+<!-- The key features of this package -->
+
+* Retrieve information from Windows services
+* Connect to and manipulate Windows services (start, pause, stop or other operations)
+
+## How to Use
+
+<!-- A compelling example on how to use this package with code, as well as any specific guidelines for when to use the package -->
+
+### Retrieve Windows service information
+```C#
+using System.ServiceProcess;
+
+// Loop through all installed Windows services and print the name, status and display name.
+foreach (ServiceController serviceController in ServiceController.GetServices())
+{
+    Console.WriteLine("Name: " + serviceController.ServiceName);
+    Console.WriteLine("Status: " + serviceController.Status.ToString());
+    Console.WriteLine("Display name: " + serviceController.DisplayName);
+}
+
+// Loop through all installed device driver services
+foreach (ServiceController serviceController in ServiceController.GetDevices())
+{
+    Console.WriteLine("Name: " + serviceController.ServiceName);
+    Console.WriteLine("Status: " + serviceController.Status.ToString());
+    Console.WriteLine("Display name: " + serviceController.DisplayName);
+}
+```
+
+### Manipulate a Windows service
+```C#
+using System.ServiceProcess;
+
+ServiceController service = new("TestServiceName");
+if (service.CanStop && service.Status != ServiceControllerStatus.Stopped && service.Status != ServiceControllerStatus.StopPending)
+{
+    service.Stop();
+}
+```
+
+## Main Types
+
+<!-- The main types provided in this library -->
+
+The main types provided by this library are:
+
+* `System.ServiceProcess.ServiceController`
+* `System.ServiceProcess.ServiceControllerStatus`
+* `System.ServiceProcess.ServiceType`
+
+## Additional Documentation
+
+<!-- Links to further documentation. Remove conceptual documentation if not available for the library. -->
+
+* [System.ServiceController API documentation](https://learn.microsoft.com/dotnet/api/system.serviceprocess.servicecontroller?view=dotnet-plat-ext-7.0)
+
+## Feedback & Contributing
+
+<!-- How to provide feedback on this package and contribute to it -->
+
+System.ServiceProcess.ServiceController is released as open source under the [MIT license](https://licenses.nuget.org/MIT). Bug reports and contributions are welcome at [the GitHub repository](https://github.com/dotnet/runtime).