Start with the basic .gitignore file

.gitignore

@@ -0,0 +1,15 @@
+# ref: https://github.com/github/gitignore/blob/master/Composer.gitignore
+
+composer.phar
+/vendor/
+
+# Commit your application's lock file https://getcomposer.org/doc/01-basic-usage.md#commit-your-composer-lock-file-to-version-control
+# You may choose to ignore a library lock file http://getcomposer.org/doc/02-libraries.md#lock-file
+# composer.lock
+
+# php-cs-fixer cache
+.php_cs.cache
+.php-cs-fixer.cache
+
+# PHPUnit cache
+.phpunit.result.cache