add autoaupdater, update readme

autoupdater using systemd timer and service.

autoupdater/tetosong.service

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+[Unit]
+Description=tetosong updater
+Wants=tetosong.timer
+
+[Service]
+Type=oneshot
+ExecStart=/usr/bin/bash -c "curl -s file:///home/eric/GitHub/TetoSongOfTheDay/autoupdater/updater.sh | bash"

autoupdater/tetosong.timer

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+[Unit]
+Description=Run tetosong service once a week
+
+[Timer]
+OnCalendar=Sun *-*-* 05:00:00
+Persistent=true
+Unit=tetosong.service
+
+[Install]
+WantedBy=timers.target

autoupdater/updater.sh

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+#!/usr/bin/bash
+# download custom fortunes and config file
+echo "Updating tetosong..."
+# check if the config file exists, if not download it and prompt the user for options.
+if [ ! -f ~/.local/share/tetosong/tetosong.config ]; then
+    echo "Config file not found, downloading default..."
+    curl -sLo ~/.local/share/tetosong/tetosong.config https://raw.githubusercontent.com/eric5949/tetosong/refs/heads/main/tetosong.config
+fi
+mkdir -p ~/.local/share/tetosong
+curl -sLo ~/.local/share/tetosong/tetofortunes https://raw.githubusercontent.com/eric5949/tetosong/refs/heads/main/tetofortunes
+curl -sLo ~/.local/share/tetosong/tetofortunes.dat https://raw.githubusercontent.com/eric5949/tetosong/refs/heads/main/tetofortunes.dat
+curl -sLo ~/.local/share/tetosong/sv2SOTD.wav https://raw.githubusercontent.com/eric5949/tetosong/refs/heads/main/sv2SOTD.wav
+
+# set up autoupdater
+# # i use systemd, so i use systemd timers.  I'll figure out something for non-systemd users later.
+AUTOUPDATE="$(. ~/.local/share/tetosong/tetosong.config; echo $AUTOUPDATE)"
+if [ "$AUTOUPDATE" = "YES" ]; then
+    # write and enable systemd service file and timer user services
+    echo "Auto-Updater enabled, updating service..."
+    mkdir -p ~/.config/systemd/user
+    curl -sLo ~/.config/systemd/user/tetosong.service https://raw.githubusercontent.com/eric5949/tetosong/refs/heads/main/autoupdater/tetosong.service
+    curl -sLo ~/.config/systemd/user/tetosong.timer https://raw.githubusercontent.com/eric5949/tetosong/refs/heads/main/autoupdater/tetosong.timer
+    systemctl --user daemon-reload
+    systemctl --user enable tetosong.timer
+    systemctl --user start tetosong.timer
+else
+    echo "Autoupdater disabled, skipping service update."
+fi
+# write tetosong to ~/.local/bin and tell the user how to use it.
+echo "writing tetosong to ~/.local/bin"
+mkdir -p ~/.local/bin
+curl -sLo ~/.local/bin/tetosong https://raw.githubusercontent.com/eric5949/tetosong/refs/heads/main/tetosong
+chmod +x ~/.local/bin/tetosong
+echo "Update complete"