docs: Added docs about onPlayer** events

docs/defaultEvents/player/onPlayerChangeHealth.md

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+# `event` onPlayerChangeHealth
+This event is triggered when player health changes.
+
+Original: [onPlayerChangeHealth](https://gothicmultiplayerteam.gitlab.io/docs/0.3.0/script-reference/server-events/player/onPlayerChangeHealth/)
+
+## Parameters
+* `dict` **kwargs**:
+    * `int` **playerid**: the id of the player whose health points gets changed.
+    * `int` **oldHP**: the previous health points of the player.
+    * `int` **newHP**:  the new health points of the player.
+    
+## Usage
+```python
+import g2o
+        
+@g2o.event('onPlayerChangeHealth')
+def onChangeHealth(**kwargs):
+    print(f'Player {kwargs['playerid']} changed health: {kwargs['oldHP']} -> {kwargs['newHP']}')
+```