Add linqpad samples

Sharp7.Rx/linqpad-samples/Write and read value.linq

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+<Query Kind="Statements">
+  <NuGetReference Prerelease="true">Sharp7.Rx</NuGetReference>
+  <Namespace>Sharp7.Rx</Namespace>
+  <Namespace>System.Reactive.Linq</Namespace>
+  <Namespace>System.Reactive.Threading.Tasks</Namespace>
+  <Namespace>System.Threading.Tasks</Namespace>
+</Query>
+
+var ip = "10.30.3.221";  // Set IP address of S7
+var db = 3;              // Set to an existing DB
+
+// For rack number and cpu mpi address see 
+// https://github.com/fbarresi/Sharp7/wiki/Connection#rack-and-slot
+var rackNumber = 0;
+var cpuMpiAddress = 0;
+
+using var plc = new Sharp7Plc(ip, rackNumber, cpuMpiAddress);
+
+await plc.InitializeAsync();
+await plc.ConnectionState
+	.FirstAsync(c => c == Sharp7.Rx.Enums.ConnectionState.Connected)
+	.ToTask();
+
+"Connection established".Dump();
+
+for (int i = 0; i < 10; i++)
+{
+	await plc.SetValue($"DB{db}.Int6", (short)i);
+	var value = await plc.GetValue<short>($"DB{db}.Int6");
+	value.Dump();
+	
+	await Task.Delay(200);
+}
+
+