fix: Directory separator inconsistencies causing bad resolution of in…

…ternal/external path.

Merge pull request #5 from ElementaryFramework/hotfix/lastmodtime-bug

Check if file exists before to get `lastmodtime`

Merge pull request #4 from ElementaryFramework/php8

Support for PHP 8

Update README.md

Add badges

Add a default exclude pattern for composer packages folder

Add a README to the project

Merge branch 'master' of https://github.com/ElementaryFramework/FireFS