docs: Added onPlayerDamage event

+ added info boxes about event cancelling

docs/defaultEvents/player/onPlayerDamage.md

@@ -0,0 +1,21 @@
+# `event` onPlayerDamage
+> [!TIP] This event can be cancelled
+This event is triggered when player receives damage.
+
+Original: [onPlayerDamage](https://gothicmultiplayerteam.gitlab.io/docs/0.3.0/script-reference/server-events/player/onPlayerDamage/)
+
+## Parameters
+* `dict` **kwargs**:
+    * `int` **playerid**: the id of the player who died.
+    * `int` **killerid**: the id of the killer. If killerid is set to `-1`, it means that there was no killer. In this particular case damage source can be fall from a tall object or scripts.
+    * `DamageDescription` **description**: a structure containing damage information. For more information see [DamageDescription](../../classes/game/DamageDescription.md)
+    
+## Usage
+```python
+import g2o
+        
+@g2o.event('onPlayerDamage')
+def onDamage(**kwargs):
+    desc = kwargs['description']
+    print(f'Ouch! Player {kwargs['playerid']} just received {desc.damage} damage.')
+```