Add composer.json and package.json for linting with Travis

package.json

@@ -0,0 +1,26 @@
+{
+    "name": "underscores",
+    "version": "1.0.0",
+    "description": "Hi. I'm a starter theme called _s, or underscores, if you like. I'm a theme meant for hacking so don't use me as a Parent Theme. Instead try turning me into the next, most awesome, WordPress theme out there. That's what I'm here for.",
+    "author": "Automattic Theme Team",
+    "license": "GPL-2.0-or-later",
+    "keywords": [
+      "WordPress",
+	  "Theme"
+	],
+    "homepage": "https://github.com/Automattic/_s#readme",
+    "repository": {
+      "type": "git",
+      "url": "git+https://github.com/Automattic/_s.git"
+    },
+    "bugs": {
+      "url": "https://github.com/Automattic/_s/issues"
+    },
+    "devDependencies": {
+      "@wordpress/scripts": "^7.1.3"
+    },
+    "scripts": {
+      "lint:scss": "wp-scripts lint-style 'sass/**/*.scss'",
+      "lint:js": "wp-scripts lint-js 'js/*.js'"
+    }
+}