docs: Added docs about onPlayer** events

docs/defaultEvents/player/onPlayerCommand.md

@@ -0,0 +1,24 @@
+# `event` onPlayerCommand
+This event is triggered when a player uses command on the chat.
+Command always begins with forward slash `/`.
+
+Original: [onPlayerCommand](https://gothicmultiplayerteam.gitlab.io/docs/0.3.0/script-reference/server-events/player/onPlayerCommand/)
+
+## Parameters
+* `dict` **kwargs**:
+    * `int` **playerid**: the id of the player who typed the command.
+    * `str` **command**: used command name on the chat.
+    * `str` **params**:  command parameters divided by space.
+    
+## Usage
+```python
+import g2o
+        
+@g2o.event('onPlayerCommand')
+def onCommand(**kwargs):
+    # Spliting and formating params
+    params = [eval(x) if not x.isalpha() else x for kwargs['params'].split()]
+    
+    if kwargs['command'] == 'add' and len(params) == 2:
+        print('Sum is: ', params[0] + params[1])            # /add 5 10 -> output: Sum is 15
+```