add a note about miio-extract-tokens

README.md

@@ -61,6 +61,47 @@ or by using the automatic discovery.
 
 This will also work for all other devices as long as the device has been bound with the Mi Home mobile application, and is therefore preferable way to attain the token.
 
+### miio-extract-tokens
+
+The package installs also a tool to simplify the extraction of tokens.
+In order to use this you have to follow the above-mentioned procedure to get a tar file (Android) or a SQlite database (Android & Apple),
+from which the tokens can be automatically extracted using the tool.
+Encrypted tokens (as used recently on Apple devices) are also automatically decrypted when needed.
+
+*Please feel free to submit pull requests to simplify this procedure even more!*
+
+```
+$ miio-extract-tokens backup.tar
+Opened backup/backup.tar
+Extracting to /tmp/tmpvbregact
+Reading tokens from Android DB
+Gateway
+        Model: lumi.gateway.v3
+        IP address: 192.168.XXX.XXX
+        Token: 91c52a27eff00b954XXX
+        MAC: 28:6C:07:XX:XX:XX
+room1
+        Model: yeelink.light.color1
+        IP address: 192.168.XXX.XXX
+        Token: 4679442a069f09883XXX
+        MAC: F0:B4:29:XX:XX:XX
+room2
+        Model: yeelink.light.color1
+        IP address: 192.168.XXX.XXX
+        Token: 7433ab14222af5792XXX
+        MAC: 28:6C:07:XX:XX:XX
+Flower Care
+        Model: hhcc.plantmonitor.v1
+        IP address: 134.XXX.XXX.XXX
+        Token: 124f90d87b4b90673XXX
+        MAC: C4:7C:8D:XX:XX:XX
+Mi Robot Vacuum
+        Model: rockrobo.vacuum.v1
+        IP address: 192.168.XXX.XXX
+        Token: 476e6b70343055483XXX
+        MAC: 28:6C:07:XX:XX:XX
+```
+
 ### Automatic discovery (does not work on all devices and firmware versions)
 
 The automatic discovery works only before the device has been connected over the app to your local wifi.