Password Checker: Initial Skeleton (#18700)

Co-authored-by: Brad Jorsch <anomiex@users.noreply.github.com>

projects/packages/password-checker/.gitattributes

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+# Files not needed to be distributed in the package.
+.gitattributes   export-ignore
+.github/         export-ignore
+phpunit.xml.dist export-ignore
+tests/           export-ignore
+
+# Files not needed in the production build.
+/changelog/**    production-exclude

projects/packages/password-checker/.gitignore

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+wordpress

projects/packages/password-checker/CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+

projects/packages/password-checker/README.md

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+# Password Checker
+
+Password Checker package.
+
+### Usage
+
+Add a new test:
+
+```php
+$tests = array(
+	'preg_match'      => array(
+		'no_backslashes' => array(
+			'pattern'          => '/^[^\\\\]*$/u',
+			'error'            => __( 'Passwords may not contain the character "\".', 'jetpack' ),
+			'required'         => true,
+			'fail_immediately' => true,
+		),
+	),
+	'compare_to_list' => array(
+		'not_a_common_password' => array(
+			'list_callback'    => 'get_common_passwords',
+			'compare_callback' => 'negative_in_array',
+			'error'            => __( 'This is a very common password. Choose something that will be harder for others to guess.', 'jetpack' ),
+			'required'         => true,
+		),
+	)
+);
+$tests = apply_filters( 'password_checker_tests', $tests );
+```
+
+Test a password:
+
+```php
+use Automattic\Jetpack\Password_Checker;
+
+$user = new WP_User( 1 );
+$password_checker = new Password_Checker( $user );
+$password_checker->test( '123', true );
+```

projects/packages/password-checker/changelog/add-changelogger-to-password-package

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+Significance: major
+Type: added
+
+Initial release.

projects/packages/password-checker/composer.json

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+{
+	"name": "automattic/jetpack-password-checker",
+	"description": "Password Checker.",
+	"type": "library",
+	"license": "GPL-2.0-or-later",
+	"require": {},
+	"require-dev": {
+		"automattic/jetpack-changelogger": "1.1.x-dev",
+		"automattic/wordbless": "@dev",
+		"yoast/phpunit-polyfills": "0.2.0"
+	},
+	"autoload": {
+		"classmap": [
+			"src/"
+		]
+	},
+	"scripts": {
+		"phpunit": [
+			"@composer install",
+			"./vendor/phpunit/phpunit/phpunit --colors=always"
+		],
+		"test-coverage": [
+			"@composer install",
+			"phpdbg -d memory_limit=2048M -d max_execution_time=900 -qrr ./vendor/bin/phpunit --coverage-clover \"$COVERAGE_DIR/clover.xml\""
+		],
+		"test-php": [
+			"@composer phpunit"
+		],
+		"post-update-cmd": "php -r \"copy('vendor/automattic/wordbless/src/dbless-wpdb.php', 'wordpress/wp-content/db.php');\""
+	},
+	"repositories": [
+		{
+			"type": "path",
+			"url": "../*",
+			"options": {
+				"monorepo": true
+			}
+		}
+	],
+	"minimum-stability": "dev",
+	"prefer-stable": true,
+	"extra": {
+		"mirror-repo": "Automattic/jetpack-password-checker",
+		"changelogger": {
+			"link-template": "https://github.com/Automattic/jetpack-password-checker/compare/v${old}...v${new}"
+		},
+		"branch-alias": {
+			"dev-master": "0.1.x-dev"
+		}
+	}
+}

projects/packages/password-checker/phpunit.xml.dist

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+<phpunit bootstrap="tests/php/bootstrap.php" backupGlobals="false" colors="true">
+	<testsuites>
+		<testsuite name="main">
+			<directory prefix="test" suffix=".php">tests/php</directory>
+		</testsuite>
+	</testsuites>
+	<filter>
+		<whitelist>
+			<directory suffix=".php">.</directory>
+			<exclude>
+				<directory suffix=".php">tests</directory>
+				<directory suffix=".php">vendor</directory>
+				<directory suffix=".php">views</directory>
+			</exclude>
+		</whitelist>
+	</filter>
+</phpunit>