add note about needing termux-api ; allow external access so xdg-open and termux-open work properly

_setup.sh

@@ -62,6 +62,7 @@ if grep -q "Android" <<< `uname -a`; then
 fi
 
 echo "exa fd bat tmux htop nano most ripgrep emacs zsh lf restic rclone glow"
+echo "termux-api"
 echo "copy restic.sh if desired/needed"
 echo "setup rclone for org/nextcloud sync if necessary (use 'nc-personal' for destination name)"
 echo "run tmux and do <prefix>-I to install plugins and finish setup"

termux/termux.properties

@@ -1,3 +1,4 @@
+allow-external-apps = true
 extra-keys = [ \
   [ \
     'ESC', \