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README.md

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+# Omnisend Core Plugin
+
+## PHP Linting
+
+WordPress.org team mandates our plugin to be linted
+against [WordPress coding standards](https://github.com/WordPress/WordPress-Coding-Standards).
+
+After each push to any branch `PHP Standards` action will run and all the PHP code will be linted. See action output for results.
+
+### Linting locally
+
+Tools needed:
+
+-   php (7.4 version is recommended because at the time of writing WordPress coding standards supports only up to 7.4 version);
+-   composer (can be installed as described in https://getcomposer.org/doc/00-intro.md#installation-linux-unix-macos);
+
+After installing those tools one can run in local plugin dir (plugin_woocommerce_api) helper script:
+
+```shell
+./lint.sh check
+./lint.sh fix
+```
+
+or all commands manually. Following commands
+
+```shell
+composer update
+composer install
+```
+
+install linting tool and standards. And then actual linting `phpcs` script can be initiated with
+
+```shell
+./vendor/squizlabs/php_codesniffer/bin/phpcs --ignore=.js --standard=WordPress omnisend-connect
+```
+
+A second `phpcbf` script can be run to automatically correct coding standard violations:
+
+```shell
+./vendor/squizlabs/php_codesniffer/bin/phpcbf --ignore=.js --standard=WordPress omnisend-connect
+```