Add project files.

SampleAddon/AddonMain.cs

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+using System.Reflection;
+using AddonLib;
+
+[assembly: Addon("Sample Addon", "Addon Author", "1.0.0")]
+
+namespace SampleAddon;
+
+public sealed class AddonMain : AddonBase
+{
+    // Listen for host OnTick event by method name
+    [AddonCallback]
+    private void OnTick(AddonContext ctx)
+    {
+        Console.WriteLine($"[{ctx.Name}] Tick received. Counter is {GetHostValue("Counter")}");
+
+        var response = CallHost("Echo", $"Tick at {DateTime.Now:HH:mm:ss}");
+        Console.WriteLine(response);
+
+        // Increment host Counter
+        var counter = (int?)GetHostValue("Counter") ?? 0;
+        SetHostValue("Counter", counter + 1);
+    }
+
+    public override void OnLoaded()
+    {
+        Console.WriteLine("SampleAddon loaded");
+    }
+
+    public override void OnUnloading()
+    {
+        Console.WriteLine("SampleAddon unloading");
+    }
+}