docs: Added docs about onPlayer** events

docs/defaultEvents/player/onPlayerChangeColor.md

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+# `event` onPlayerChangeColor
+This event is triggered when player nickname color was changed for all players.
+
+Original: [onPlayerChangeColor](https://gothicmultiplayerteam.gitlab.io/docs/0.3.0/script-reference/server-events/player/onPlayerChangeColor/)
+
+## Parameters
+* `dict` **kwargs**:
+    * `int` **playerid**: the id of the player whose nickname color was changed.
+    * `int` **r**: the amount of red in the nickname color `(0 - 255)`.
+    * `int` **g**: the amount of green in the nickname color `(0 - 255)`.
+    * `int` **b**: the amount of blue in the nickname color `(0 - 255)`.
+    
+## Usage
+```python
+import g2o
+        
+@g2o.event('onPlayerChangeColor')
+def onChangeColor(**kwargs):
+    # Slicing out playerid and converting from {r: num, g: num, b: num} 
+    # to (num, num, num)
+    rgbColor = tuple(list(kwargs.values())[1:])
+    # Formating rgb into hex color
+    hexColor = '#%02x%02x%02x' % rgbColor
+    print(f'Player {kwargs['playerid']} changed his color to {hexColor}')
+```