-> PortScanner added

Networking/PortScanner/PortScannerBase.cs

@@ -0,0 +1,28 @@
+using System.Net.Sockets;
+using System.Threading;
+using System.Threading.Tasks;
+
+// This is the base class for all Port Scanners
+namespace PortScanner
+{
+    abstract class PortScannerBase
+    {
+        // Hostname and port properties for scanning
+        public string Hostname { get; set; }
+        public int Port { get; set; }
+
+        // Timeout property that specifies how long to wait for an answer
+        public int Timeout { get; set; }
+
+        // Base construcor - just set up default values for properties
+        public PortScannerBase()
+        {
+            Hostname = "127.0.0.1";
+            Port = 22;
+            Timeout = 1000;
+        }
+
+        // Check that the hostname is listening on the port - asynchronously
+        public abstract Task<bool> CheckOpenAsync(CancellationToken ct);
+    }
+}