Add config option for receiving ephemeral events with MSC2409

mautrix_telegram/example-config.yaml

@@ -72,6 +72,11 @@ appservice:
     # Example: "+telegram:example.com". Set to false to disable.
     community_id: false
 
+    # Whether or not to receive ephemeral events via appservice transactions.
+    # Requires MSC2409 support (i.e. Synapse 1.22+).
+    # You should disable bridge -> sync_with_custom_puppets when this is enabled.
+    ephemeral_events: false
+
     # Authentication tokens for AS <-> HS communication. Autogenerated; do not modify.
     as_token: "This value is generated when generating the registration"
     hs_token: "This value is generated when generating the registration"
@@ -185,7 +190,8 @@ bridge:
     # manually.
     # If using this for other servers than the bridge's server,
     # you must also set the URL in the double_puppet_server_map.
-    login_shared_secret_map: {}
+    login_shared_secret_map:
+        example.com: foobar
     # Set to false to disable link previews in messages sent to Telegram.
     telegram_link_preview: true
     # Use inline images instead of a separate message for the caption.