Add scripts to enable multilib and install yay

This commit adds two new scripts: `enable-multilib.sh` and `install-yay-arch.sh`. The `enable-multilib.sh` script enables multilib libraries by uncommenting the [multilib] section in `/etc/pacman.conf` and updating the system. The `install-yay-arch.sh` script installs yay, a package manager for Arch Linux, if it is not already installed. Both scripts include error handling and custom error messages.

scripts/enable-multilib.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+
+# Exit if any command fails and treat unset variables as an error
+set -eu
+
+# Function to execute a command and print a custom error message if it fails
+execute() {
+    echo "$2"
+    $1
+}
+
+# Ensure the script is being run with superuser privileges
+if [[ $EUID -ne 0 ]]; then
+   echo "This script must be run as root" 
+   exit 1
+fi
+
+# Function to enable multilib libraries
+enable_multilib() {
+    # Uncomment the [multilib] section in /etc/pacman.conf
+    execute "sed -i '/\[multilib\]/,/Include/s/^#//g' /etc/pacman.conf" "Enabling multilib libraries..."
+
+    # Update the system
+    execute "pacman -Sy" "Updating the system..."
+}
+
+# Call the function to enable multilib libraries
+enable_multilib

scripts/install-yay-arch.sh

@@ -0,0 +1,40 @@
+#!/bin/bash
+
+# Exit if any command fails and treat unset variables as an error
+set -eu
+
+# Function to execute a command and print a custom error message if it fails
+execute() {
+    echo "$2"
+    $1
+}
+
+# Ensure the script is being run with superuser privileges
+if [[ $EUID -ne 0 ]]; then
+   echo "This script must be run as root" 
+   exit 1
+fi
+
+# Function to install yay
+install_yay() {
+    # Check if yay is already installed
+    if ! command -v yay &> /dev/null; then
+        execute "git clone https://aur.archlinux.org/yay.git" "Cloning yay repository..."
+        cd yay
+        execute "makepkg -si --noconfirm" "Building and installing yay..."
+        cd ..
+        execute "rm -rf yay" "Cleaning up..."
+    else
+        echo "yay is already installed."
+    fi
+
+    # Validate installation
+    if command -v yay &> /dev/null; then
+        echo "yay is installed successfully."
+    else
+        echo "Failed to install yay."
+    fi
+}
+
+# Call the function to install yay
+install_yay