Add notes on storing spotifyd password into keyring with secret-tool.

bash/.config/spotifyd/spotifyd.conf

@@ -18,6 +18,12 @@ username = "yebgbl8yxona2fx1dwwkncw52"
 #
 # This is an alternative to the `password` field. Both
 # can't be used simultaneously.
+#
+# **Save password to keyring with:**
+#
+# `secret-tool store  --label='spotifyd' application rust-keyring service spotifyd username <username>`
+# and then enter password on the command line.
+# Confirm credential lookup with: `spotifyd --no-daemon`!!
 use_keyring = true
 
 # The audio backend used to play the your music. To get