Added docs for new Sun Events Scheduler

docs/user/extensions/scheduling.md

@@ -29,9 +29,20 @@ Install-Package NetDaemon.Extensions.Scheduling
         .AddNetDaemonScheduler()
 ```
 
+* If you want to schedule based on Sun Events (e.g. trigger at sunrise/sunset), then also register the SunEventsScheduler:
+
+```csharp
+.ConfigureServices((_, services) =>
+    services
+        .AddAppsFromAssembly(Assembly.GetExecutingAssembly())
+        .AddNetDaemonStateManager()
+        .AddNetDaemonScheduler()
+        .AddSunEventScheduler(latitude, longitude)
+```
+
 ### Injecting the scheduler
 
-You can get an instance of the `IScheduler` interface bye simply injecting it into your apps constructor:
+You can get an instance of the `IScheduler` interface by simply injecting it into your apps constructor:
 
 ```csharp
 using System.Reactive.Concurrency.Scheduler; 
@@ -49,6 +60,16 @@ __IScheduler.Now always returns UTC. Use `Now.LocalDateTime` to get the current
 
 :::
 
+For Sun Events, inject the `ISunEventScheduler` instance into your app.
+
+```csharp
+using System.Reactive.Concurrency.Scheduler; 
+
+[NetDaemonApp]
+class MyApp(ISunEventScheduler sunEventScheduler)
+{ }
+```
+
 ### Using the Scheduler
 
 The `System.Reactive.Concurrency.Scheduler` namespace provides several extension methods for `IScheduler` that allow you to schedule tasks at a specific time, after a specific `TimeSpan`, or periodically. You can use these framework provided methods directly on the scheduler you received via the constructor and they will be scheduled using the cancellation and logging behavior.
@@ -81,6 +102,19 @@ The first argument of this method is a [Cron expression](https://en.wikipedia.or
 
 The `ScheduleCron()` extension method uses [Cronos](https://github.com/HangfireIO/Cronos) to parse your Cron expression. See its docs for the exact specification.
 
+### Sun Events
+
+The `ISunEventScheduler` enables triggering an event at Dawn, Sunrise, Sunset and Dusk. The specific times are calculated everyday based on the coordinates you provide when registering the service.
+
+```csharp
+public SunriseSchedulingApp(IHaContext ha, IScheduler scheduler)
+{
+    var entities = new Entities(ha); 
+    scheduler.RunAtSunrise(() => entities.Light.Patio.TurnOff());
+}
+```
+
+
 ## Unit testing scheduling apps
 
 Timing in some apps can be pretty complicated. It can therefore be useful to create unit tests for your schedules. For this purpose there is a special version of the `IScheduler` interface implemented by `Microsoft.Reactive.Testing.TestScheduler` in the `Microsoft.Reactive.Testing` nuget package.