Added Gruntfile.js to check for text domains and PHPCS

Gruntfile.js

@@ -0,0 +1,57 @@
+module.exports = function( grunt ) {
+	'use strict';
+
+	grunt.initConfig({
+		// Check textdomain errors.
+		checktextdomain: {
+			options:{
+				text_domain: 'action-scheduler',
+				keywords: [
+					'__:1,2d',
+					'_e:1,2d',
+					'_x:1,2c,3d',
+					'esc_html__:1,2d',
+					'esc_html_e:1,2d',
+					'esc_html_x:1,2c,3d',
+					'esc_attr__:1,2d',
+					'esc_attr_e:1,2d',
+					'esc_attr_x:1,2c,3d',
+					'_ex:1,2c,3d',
+					'_n:1,2,4d',
+					'_nx:1,2,4c,5d',
+					'_n_noop:1,2,3d',
+					'_nx_noop:1,2,3c,4d'
+				]
+			},
+			files: {
+				src:  [
+					'**/*.php',
+					'!node_modules/**',
+					'!tests/**',
+					'!vendor/**',
+					'!tmp/**'
+				],
+				expand: true
+			}
+		},
+
+		// PHP Code Sniffer.
+		phpcs: {
+			options: {
+				bin: 'vendor/bin/phpcs'
+			},
+			dist: {
+				src:  [
+					'**/*.php', // Include all php files.
+					'!deprecated/**',
+					'!node_modules/**',
+					'!vendor/**'
+				]
+			}
+		}
+	});
+
+	// Load NPM tasks to be used here.
+	grunt.loadNpmTasks( 'grunt-phpcs' );
+	grunt.loadNpmTasks( 'grunt-checktextdomain' );
+};