feat: initial import

Interfaces/ITargetSpawner.cs

@@ -0,0 +1,14 @@
+using R3;
+
+namespace GodotHostTest.Interfaces;
+
+/// <summary>
+/// An object that spawns targets.
+/// </summary>
+public interface ITargetSpawner
+{
+    /// <summary>
+    /// Observable that produces a value whenever a target gets spawned.
+    /// </summary>
+    Observable<ITarget> TargetSpawned { get; }
+}