Implements experience gain

Plugins/PkmnLib.Plugin.Gen7/Gen7Plugin.cs

@@ -49,6 +49,7 @@ public class Gen7Plugin : Plugin<Gen7PluginConfiguration>, IResourceProvider
         registry.RegisterDamageCalculator(new Gen7DamageCalculator(Configuration));
         registry.RegisterMiscLibrary(new Gen7MiscLibrary());
         registry.RegisterCaptureLibrary(new Gen7CaptureLibrary(Configuration));
+        registry.RegisterExperienceGainCalculator(new Gen7ExperienceGainCalculator());
 
         ExplicitAIFunctionRegistration.RegisterAIFunctions(registry.ExplicitAIHandlers);
     }