Some minor changes

[NhanAZ]

• Updated composer.json
  • Change stable PHP version
  • Update PHPStan version
  • Change the README path
  • Change license
  • Change link
  • Change PSR path
• Updated .gitignore
  • Added somes comments
  • Remove composer.lock from .gitignore
  • Added .idea to .gitignore
• Update README
  • Change CodeBlock Format
  • Update config from config.yml
• Remove unless .idea folder
• Added composer.lock
• Change the author's name at LICENSE
• Change the YAML standard format at plugin.yml
• Remove unless space in config.yml
• Etc...