feat: Add possibility to start bot via async context manager

discord/client.py

@@ -251,6 +251,20 @@ def __init__(
             VoiceClient.warn_nacl = False
             _log.warning("PyNaCl is not installed, voice will NOT be supported")
 
+    async def __aenter__(self) -> Client:
+        loop = asyncio.get_running_loop()
+        self.loop = loop
+        self.http.loop = loop
+        self._connection.loop = loop
+
+        self._ready = asyncio.Event()
+
+        return self
+
+    async def __aexit__(self) -> None:
+        if not self.is_closed():
+            await self.close()
+
     # internals
 
     def _get_websocket(