Add CLI logs section (#1060)

guides/cli.rst

@@ -218,4 +218,30 @@ through a graphical user interface.
 
     If set, opens the dashboard UI in a browser once the server is up and running.
 
+``logs`` Command
+---------------------
+
+.. program:: esphome logs
+
+The ``esphome <CONFIG> logs`` command validates the configuration and shows all logs.
+
+.. option:: --topic TOPIC
+
+    Manually set the topic to subscribe to.
+
+.. option:: --username USERNAME
+
+    Manually set the username.
+
+.. option:: --password PASSWORD
+
+    Manually set the password.
+
+.. option:: --client-id CLIENT_ID
+
+    Manually set the client id.
+
+.. option:: --serial-port SERIAL_PORT
+
+    Manually specify a serial port to use. For example ``/dev/cu.SLAB_USBtoUART``.