feat: initial import

Helpers/ObservableHelpers.cs

@@ -0,0 +1,19 @@
+using System;
+using R3;
+
+namespace GodotHostTest.Helpers;
+
+public static class ObservableHelpers
+{
+    public static IDisposable SubscribeOnce<T>(this Observable<T> observable, Action<T> action)
+    {
+        IDisposable? disposable = null;
+        disposable = observable.Subscribe(x =>
+        {
+            // ReSharper disable once AccessToModifiedClosure
+            disposable?.Dispose();
+            action(x);
+        });
+        return disposable;
+    }
+}