Created Working with updates (markdown)

Working-with-updates.md

@@ -0,0 +1,22 @@
+**Important note**: Updates are currently handled in a **passive** way, so **not all may be received**. Read below for more information.
+
+---
+
+The most minimal example to receive updates, and often what you will need if processing updates is all you need, is as follows:
+```python
+def update_handler(update_object):
+    # On this example, we just show the update object itself
+    print(update_object)
+
+
+# From now on, any update received will be passed to 'update_handler'
+client.add_update_handler(update_handler)
+
+input('Press <ENTER> to exit...')
+client.disconnect()
+```
+
+The `update_object` may be any instance of [`Updates`](https://lonamiwebs.github.io/Telethon/types/updates.html) or even a single [`Update`](https://lonamiwebs.github.io/Telethon/types/update.html), so you have absolute control about which updates you want to handle and which you don't. `isinstance(update_object, SomeClass)` may probe very useful here.
+
+## Note follow-up
+The library currently handles all updates in a **passive** way, so not all updates may be received. This is, all it does is listen to what the server sends. It will **not** run things like [`GetDifferenceRequest`](https://lonamiwebs.github.io/Telethon/methods/updates/get_difference.html) or take into consideration the methods that return more [`Updates`](https://lonamiwebs.github.io/Telethon/types/updates.html).