docs: Added onPlayerDropItem and onPlayerTakeItem events

docs/defaultEvents/player/onPlayerDropItem.md

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+# `event` onPlayerDropItem
+This event is triggered when player drops an item from his inventory to the ground.
+
+Original: [onPlayerDropItem](https://gothicmultiplayerteam.gitlab.io/docs/0.3.0/script-reference/server-events/player/onPlayerDropItem/)
+
+## Parameters
+* `dict` **kwargs**:
+    * `int` **playerid**: the id of the player who tries to drop the item on the ground.
+    * `ItemGround` **itemGround**: the ground item object which represents the dropped item by the player.
+    
+## Usage
+```python
+import g2o
+        
+@g2o.event('onPlayerDropItem')
+def onDropItem(**kwargs):
+    item = itemm['itemGround']
+    print(f'Player {kwargs['playerid']} dropped {item.instance} x{item.amount}')
+```