Add System.Management packag readme

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+## About
+
+<!-- A description of the package and where one can find more documentation -->
+Provides access to a rich set of management information and management events about the system, devices, and applications instrumented to the Windows Management Instrumentation (WMI) infrastructure. Not supported on other platforms.
+
+## Key Features
+
+<!-- The key features of this package -->
+
+* Consume Windows Management Instrumentation (WMI) data and events
+* High performance extensible event mechanism
+
+## 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 management information
+```C#
+using System.Management;
+
+// Get the WMI class
+ManagementClass managementClass = new("Win32_Processor");
+
+// Loop through the WMI class instances and print the processor information found
+foreach (ManagementObject managementObject in managementClass.GetInstances())
+{
+    Console.WriteLine("--- Processor information ---");
+    Console.WriteLine($"Name: {managementObject["Name"]}");
+    Console.WriteLine($"Architecture: {managementObject["Architecture"]}");
+}
+```
+
+### Query management information via the SelectQuery type 
+```C#
+using System.Management;
+
+// Search for win32 services with a stopped state
+SelectQuery selectQuery = new("Win32_Service", "State = 'Stopped'");
+ManagementObjectSearcher managementObjectSearcher = new(selectQuery);
+
+foreach (ManagementObject service in managementObjectSearcher.Get())
+{
+    Console.WriteLine(service.ToString());
+}
+```
+
+## Main Types
+
+<!-- The main types provided in this library -->
+
+The main types provided by this library are:
+
+* `System.Management.ManagementClass`
+* `System.Management.ManagementObject`
+* `System.Management.SelectQuery`
+
+## Additional Documentation
+
+<!-- Links to further documentation. Remove conceptual documentation if not available for the library. -->
+
+* [Conceptual documentation](https://learn.microsoft.com/windows/win32/wmisdk/wmi-start-page)
+* [System.Management API documentation](https://learn.microsoft.com/dotnet/api/system.management?view=dotnet-plat-ext-7.0)
+* [System.Management.ManagementClass documentation](https://learn.microsoft.com/dotnet/api/system.management.managementclass.-ctor?view=dotnet-plat-ext-7.0)
+
+## Feedback & Contributing
+
+<!-- How to provide feedback on this package and contribute to it -->
+
+System.Management 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).