Mention how not to spawn the ReadThread

Working-with-Updates.md

@@ -43,6 +43,32 @@ We only ask you one thing: don't keep this running for too long, or your contact
 
 **WIP**
 
-## Using the main thread instead the read thread
+## Using the main thread instead the `ReadThread`
 
-**WIP**
+If you have no work to do on the `MainThread` and you were planning to have a `while True: sleep(1)`, don't do that. Instead, don't spawn the secondary `ReadThread` at all like so:
+```python
+client = TelegramClient(
+    ...
+    spawn_read_thread=False
+)
+```
+
+And then `.idle()` from the `MainThread`:
+```python
+client.idle()
+```
+
+You can stop it with <kbd>Ctrl+C</kbd>, and you can configure the signals to be used in a similar fashion to [Python Telegram Bot](https://github.com/python-telegram-bot/python-telegram-bot/blob/4b3315db6feebafb94edcaa803df52bb49999ced/telegram/ext/updater.py#L460).
+
+As a complete example:
+```python
+def callback(update):
+    print('I received', update)
+
+client = TelegramClient('anon', api_id, api_hash,
+                        update_workers=1, spawn_read_thread=False)
+
+client.connect()
+client.add_update_handler(callback)
+client.idle()
+```