Renamed interface to IOnLoad

Added OnLoad mod
Expanded `OnLoadOrder` options

ExampleMods/Mods/8AddOnLoad/AddOnLoad.cs

@@ -0,0 +1,33 @@
+using Core.DI;
+using Core.Models.Utils;
+using SptCommon.Annotations;
+
+namespace ExampleMods.Mods._8AddOnLoad
+{
+    // Flag class as being OnLoad and give it a load priority, check `OnLoadOrder` for list of possible choices
+    [Injectable(InjectableTypeOverride = typeof(IOnLoad), TypePriority = OnLoadOrder.PostSptDatabase)]
+    [Injectable(InjectableTypeOverride = typeof(AddOnLoad))]
+    public class AddOnLoad : IOnLoad // Must implement the IOnLoad interface
+    {
+        private readonly ISptLogger<AddOnLoad> _logger;
+
+        public AddOnLoad(
+            ISptLogger<AddOnLoad> logger)
+        {
+            _logger = logger;
+        }
+
+        public Task OnLoad()
+        {
+            // Can do work here
+            _logger.Success($"Mod loaded after database!");
+
+            return Task.CompletedTask;
+        }
+
+        public string GetRoute()
+        {
+            return "mod-load-example";
+        }
+    }
+}