feat: Extended supported licenses (#9)

* feat: Extended supported licenses

* fix: Fixed typo in license name

* feat: Added full SPDX licence support

* fix: Fixed typo

* docs: Fixed header

* docs: Updated arg description

Author: frgfm

action.yml

@@ -11,10 +11,10 @@ inputs:
     description: 'License of your project'
     required: true
   owner:
-    description: 'The copyright owner'
+    description: 'Name of the copyright owner'
     required: true
   starting-year:
-    description: 'The starting year of your project'
+    description: 'Starting year of your project'
     required: true
   folders:
     description: 'Folders to inspect'