Implement master branch creation from main branch

create-master-branch.sh

@@ -0,0 +1,41 @@
+#!/bin/bash
+# Script to create a master branch from the main branch
+# Implements the exact commands from the problem statement:
+#   1. git checkout main
+#   2. git checkout -b master
+#   3. git push origin master
+#
+# This script includes error handling and checks for existing branches
+set -euo pipefail
+
+echo -e "\e[36m🔄 Creating master branch from main...\e[0m"
+
+# Verify we are in a git repository
+if ! git rev-parse --git-dir > /dev/null 2>&1; then
+  echo -e "\e[31m❌ Not in a git repository\e[0m"
+  exit 1
+fi
+
+# Step 1: Checkout main branch
+if ! git rev-parse --verify main >/dev/null 2>&1; then
+  echo -e "\e[31m❌ Main branch does not exist\e[0m"
+  exit 1
+fi
+git checkout main
+echo -e "\e[32m✅ Switched to main branch\e[0m"
+
+# Step 2: Create and checkout master branch
+if git rev-parse --verify master >/dev/null 2>&1; then
+  echo -e "\e[33m⚠️  Master branch already exists, switching to it\e[0m"
+  git checkout master
+else
+  echo -e "\e[34m📝 Creating new master branch\e[0m"
+  git checkout -b master
+fi
+echo -e "\e[32m✅ Switched to master branch\e[0m"
+
+# Step 3: Push master branch to origin
+git push origin master
+echo -e "\e[32m✅ Pushed master branch to origin\e[0m"
+
+echo -e "\e[32m🎉 Master branch successfully created and pushed!\e[0m"