feat: Add README and run script for Invoice Ninja setup on CasaOS, including branding and support information

setup-invoice-ninja-for-casaos-step-2/README.md

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+# Run command
+
+```bash
+bash -c "$(wget -qLO - https://raw.githubusercontent.com/bigbeartechworld/big-bear-scripts/master/setup-invoice-ninja-for-casaos-step-2/run.sh)"
+```

setup-invoice-ninja-for-casaos-step-2/run.sh

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+#!/bin/bash
+
+# Define a message for branding purposes
+MESSAGE="Made by BigBearTechWorld"
+
+# Function to print a decorative line
+print_decorative_line() {
+    # Prints a line of dashes to the console
+    printf "%s\n" "------------------------------------------------------"
+}
+
+# Print the introduction message with decorations
+echo
+print_decorative_line
+echo "Setup Invoice Ninja for CasaOS Step 2"
+print_decorative_line
+echo
+echo "$MESSAGE"
+echo
+print_decorative_line
+echo
+echo "If this is useful, please consider supporting my work at: https://ko-fi.com/bigbeartechworld"
+echo
+print_decorative_line
+
+docker exec -it big-bear-invoice-ninja php artisan migrate:fresh --seed && php artisan db:seed && php artisan ninja:create-test-data && cp .env.example .env