feat: add apply shell

usr/lib/snigdhaos-assistant/apply.sh

@@ -0,0 +1,22 @@
+if [ -e "$1" ]; then
+	echo ""
+	echo "Preparing setup.."
+	echo ""
+	sudo bash - <$1
+fi
+
+echo ""
+echo "Installing packages.."
+echo ""
+installable_packages=$(comm -12 <(pacman -Slq | sort) <(sed s/\\s/\\n/g - <$2 | sort))
+sudo pacman -S --needed $installable_packages && rm $2 || { read -p "Error! Press enter to return to setup assistant."; exit; }
+
+if [ -e "$3" ]; then
+	echo ""
+	echo "Enabling services.."
+	echo ""
+	sudo bash - <$3
+fi
+
+echo ""
+read -p "Press enter to return to setup assistant."