Plugin update tutorial

Bundled commands Inside composer several extra tools have been added: Code formatting: - composer run phpcbf Run the phpcbf, an autoformatter. - composer run phpcs Run phpcs, Checks style and syntax agianst theh WordPress coding stadard. - composer run lint Run php linter, Checks syntax. - composer run phpstan Run phpstan, Checks styntax, docblock, non existing functions/classes. - composer run ci Run all the above syntax checkers at once. Creating plugin zip: - composer run createzip Will create a zip named 'plugin-slug.zip' in the plugin folder. - composer run createzip-in-downloads Will create a zip named 'plugin-slug-0.1.0.zip' in the plugin folder. - composer run createzip-with-version Will create a zip named 'plugin-slug-0.1.0.zip' in the Downloads folder.