Add new PowerShell project

Source/MQTTnet.PowerShell/Cmdlets/DisconnectMqttSessionCmdlet.cs

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+using System.Management.Automation;
+
+namespace MQTTnet.PowerShell.Cmdlets;
+
+[Cmdlet(VerbsCommunications.Disconnect, "MqttSession")]
+public class DisconnectMqttSessionCmdlet : PSCmdlet
+{
+    [Parameter]
+    public MqttClientDisconnectOptionsReason Reason { get; set; } = MqttClientDisconnectOptionsReason.NormalDisconnection;
+
+    [Parameter]
+    public string? ReasonString { get; set; }
+
+    [Parameter(Mandatory = true, ValueFromPipeline = true)]
+    public required MqttSession Session { get; set; }
+
+    [Parameter]
+    public uint SessionExpiryInterval { get; set; }
+
+    protected override void ProcessRecord()
+    {
+        if (Session.Client.IsConnected)
+        {
+            var options = new MqttClientDisconnectOptionsBuilder().WithSessionExpiryInterval(SessionExpiryInterval).WithReason(Reason).WithReasonString(ReasonString).Build();
+
+            Session.Client.DisconnectAsync(options).GetAwaiter().GetResult();
+        }
+
+        WriteObject("Disconnected.");
+    }
+}