docs: Added docs about onPlayer** events

docs/defaultEvents/player/onPlayerEquipHandItem.md

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+# `event` onPlayerEquipHandItem
+This event is triggered when game adds item to player hand, e.g: when player opens or consumes any item. When item is removed from hand, `null` is returned instead.
+
+Original: [onPlayerEquipHandItem](https://gothicmultiplayerteam.gitlab.io/docs/0.3.0/script-reference/server-events/player/onPlayerEquipHandItem/)
+
+## Parameters
+* `dict` **kwargs**:
+    * `int` **playerid**: the id of the player who gets an item to his hand.
+    * `int` **hand**: the id of the hand in which player holds item. For more information see **TBD**.
+    * `str` **str | null**: instance: the item instance from Daedalus scripts.
+    
+## Usage
+```python
+import g2o
+        
+@g2o.event('onPlayerEquipHandItem')
+def onEquip(**kwargs):
+    print(f'Player {kwargs['playerid']} has {kwargs['instance']}, used hand with id {kwargs['hand']}')
+```