docs: Add docs about event system in FancyCore

docs/src/fancycore/api/events.md

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+---
+
+# Events
+
+FancyCore has its own event system that allows you to listen to various events that happen in the FancyCore system.
+
+## Registering an event listener
+
+Example for registering a listener for the `PlayerReportedEvent`:
+
+```java
+EventService eventService = FancyCore.get().getEventService();
+eventService.registerListener(PlayerReportedEvent.class, (event) -> {
+    System.out.println("PlayerReportedEvent fired with report id: " + event.getReport().id());
+});
+```
+
+## Available events
+
+### Player events
+
+| Event                 | Description                                                                   |
+|-----------------------|-------------------------------------------------------------------------------|
+| `PlayerModifiedEvent` | Event fired when a player's data is modified (through FancyPlayer's setters). |
+| `PlayerReportedEvent` | Fired when a player is reported.                                              |
+| `PlayerPunishedEvent` | Fired when a player receives a punishment (warning, kick, mute or ban).       |

docs/src/fancycore/api/getting-started.md

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 # Getting started