passwd: Password storage configuration doc in README

README.md

@@ -34,6 +34,35 @@ ninja -C _build
 sudo ninja -C _build install
 ```
 
+### Password Storage
+
+Fractal uses Secret Service to store the password so you should have
+running some daemon that give that service. If you're using GNOME or KDE
+this should work for you out of the box with gnome-keyring or
+ksecretservice.
+
+There's a way to avoid the need of secret service and store the password in
+a unsecure way, in a plain json file. We don't recommend to use this form,
+but if you want, it's possible to configure using gsettings:
+
+```
+$ gsettings set org.gnome.Fractal password-storage 'Plain text'
+```
+
+Or if you're using flatpak
+
+```
+$ flatpak run --command="bash" org.gnome.Fractal
+$ gsettings set org.gnome.Fractal password-storage 'Plain text'
+$ exit
+```
+
+To go back to use Secret service:
+
+```
+$ gsettings set org.gnome.Fractal password-storage 'Secret Service'
+```
+
 ## Supported m.room.message (msgtypes)
 
 msgtypes          | Recv                | Send
@@ -60,4 +89,4 @@ The first version of this project was called guillotine, based on French revolut
 in relation with the Riot client name, but it's a negative name so we decide
 to change for a math one.
 
-The name Fractal was proposed by Regina Bíró.
+The name Fractal was proposed by Regina Bíró.