Add Prettier shared config package

packages/prettier-config/README.md

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+# Prettier Config
+
+WordPress Prettier shareable config for [Prettier](https://prettier.io).
+
+## Installation
+
+Install the module
+
+```shell
+$ npm install @wordpress/Prettier-config --save-dev
+```
+
+## Usage
+
+Add this to your `package.json` file:
+
+```json
+prettier": "@wordpress/prettier-config"
+]
+```
+
+Alternatively, add this to `.prettierrc` file:
+
+```
+extends @wordpress/prettier-config
+```
+
+<br/><br/><p align="center"><img src="https://s.w.org/style/images/codeispoetry.png?1" alt="Code is Poetry." /></p>

packages/prettier-config/__tests__/prettier-config.test.js

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+/**
+ * External dependencies
+ */
+import { isPlainObject } from 'lodash';
+
+/**
+ * Internal dependencies
+ */
+import config from '../lib/prettier-config.js';
+
+describe( 'prettier config tests', () => {
+	it( 'should be an object', () => {
+		expect( isPlainObject( config ) ).toBeTruthy();
+	} );
+} );

packages/prettier-config/lib/prettier-config.js

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+module.exports = {
+	useTabs: true,
+	tabWidth: 4,
+	printWidth: 80,
+	singleQuote: true,
+	trailingComma: 'es5',
+	bracketSpacing: true,
+	parenSpacing: true,
+	jsxBracketSameLine: false,
+	semi: true,
+	arrowParens: 'always',
+};

packages/prettier-config/package.json

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+{
+	"name": "@wordpress/prettier-config",
+	"version": "0.0.1",
+	"description": "WordPress Prettier shared configuration.",
+	"author": "The WordPress Contributors",
+	"license": "GPL-2.0-or-later",
+	"keywords": [
+		"wordpress",
+		"prettier",
+		"prettier-config"
+	],
+	"homepage": "https://github.com/WordPress/gutenberg/tree/master/packages/prettier-config/README.md",
+	"repository": {
+		"type": "git",
+		"url": "https://github.com/WordPress/gutenberg.git",
+		"directory": "packages/prettier-config"
+	},
+	"bugs": {
+		"url": "https://github.com/WordPress/gutenberg/issues"
+	},
+	"engines": {
+		"node": ">=10"
+	},
+	"files": [
+		"lib/prettier-config.js"
+	],
+	"main": "lib/prettier-config.js",
+	"publishConfig": {
+		"access": "public"
+	}
+}