feat: Added docs via MkDocs

docs/defaultEvents/onBan.md

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+# `event` onBan
+!!! note
+    If serial/mac/ip/name indexes doesn't exist, then the parameters has not been specified when ban was added.
+    If timestamp doesn't exist, then ban was permanent.
+
+This event is triggered when new ban is being added.
+
+## Parameters
+* `dict` **kwargs**:
+    * `str` **mac**: MAC address of the banned player.
+    * `str` **ip**: IP address of the banned player.
+    * `str` **serial**: serial of the banned player.
+    * `str` **name**: nickname of the banned player.
+    * `int` **timestamp**: timestamp when the ban expires.
+
+## Usage
+```python
+import g2o
+from datetime import datetime
+        
+@g2o.event('onBan')
+def onBan(**kwargs):
+    print(f'Player {kwargs['name']} has been banned.')
+    if ('timestamp' in kwargs):
+        banExpires = datetime.fromtimestamp(kwargs['timestamp'])
+        print(f'Ban expires at {banExpires}')
+```