Add sample script with task (#1281)

This script shows how to run code periodically without using a thread.

MinecraftClient/config/sample-script-with-task.cs

@@ -0,0 +1,32 @@
+//MCCScript 1.0
+
+MCC.LoadBot(new PeriodicTask());
+
+//MCCScript Extensions
+
+/// <summary>
+/// The ChatBot API is not thread-safe so tasks must occur on the main thread.
+/// This bot shows an example of running a task periodically without using threads.
+/// </summary>
+public class PeriodicTask : ChatBot
+{
+    private DateTime nextTaskRun = DateTime.Now;
+
+    /// <summary>
+    /// Called on each MCC tick, around 10 times per second
+    /// </summary>
+    public override void Update()
+    {
+        DateTime dateNow = DateTime.Now;
+        if (nextTaskRun < dateNow)
+        {
+            LogDebugToConsole("Running task @ " + dateNow);
+
+            // Your task here
+            SendText("/ping");
+
+            // Schedule next run
+            nextTaskRun = dateNow.AddSeconds(60);
+        }
+    }
+}