Automatic tool for project license

[petrs]

License badge can be obtained via shields.io as
However, most of the projects seems not to have license specified recognizably ( )
Licensechcek can be used to extract licence(s) directly from code https://metacpan.org/dist/App-Licensecheck
EDIT: Last commit date already extracted via shields.io

[petrs]

@lzaoral the issue for future fix once licence detection is working