[install.sh] || added (if not exist) conditions

[whynotdeep7]

closes #13

Solution

• Create /usr/local/bin directory with sudo mkdir -p if it doesn't exist
• Gracefully fall back to ~/.local/bin if directory creation or installation fails
• Added proper permission checks and error handling
• Provides user feedback on actual installation location and PATH configuration

you can check it if it's correct and i ran a test_install.sh on it to test it (ss attached below)

[bakayu]

Thank you for the contribution @whynotdeep7!
This will be a great addition. ^^

[whynotdeep7]

Thank you for the contribution @whynotdeep7! This will be a great addition. ^^

thanking you for giving a chance :)