feat: Added docs via MkDocs

docs/defaultEvents/onExit.md

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+# `event` onExit
+This event is triggered when server is going to shut down.
+You can use it, to save some data before closing up, or do something else.
+
+## Parameters
+No parameters.
+
+## Usage
+```python
+import g2o
+        
+@g2o.event('onExit')
+def onExitEvt(**kwargs):
+    print('Bye')
+```